Computer Support Forum

Switch question: per-port DHCP question

Question: Switch question: per-port DHCP question


I am searching for a solution at a networking problem:

Like a router, where there is a DHCP server on the router,
I need a 12, 16 or 24 port switch that is able to assign specific, preconfigured IP address to each individual port.(ie to port 1 via DHCP protocol, to port2, so if I plug a DHCP client device into port 1, it will get as its address, plug the same device to port2 gets

The switch also needs to be SNMP capable for monitoring, so it's probably going to be a managed switch.

Anyone know of a solution? please let me know.

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Preferred Solution: Switch question: per-port DHCP question

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Answer: Switch question: per-port DHCP question

I don't think you are going to get exactly what you are looking for as I don't think it's possible. The only thing I can think of is to create a VLAN for each port. Then use an IP helper for each VLAN.

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I recently had a power supply failure on a Netgear 16 port switch (GS116) and managed to get a refurbed switch and power supply.

My system set-up includes a number of terastations ranging from 1TB to 4 TB, all connected to the 16 port switch. My question relates to my oldest terastation, which cannot be accessed if connected to the new switch but can if use my old one.

I thought a switch was pretty simple, it appears to not have any firmware to update. Is this a hardware issue?


Answer:16 Port Switch and NAS devices question

Yes. If the choice of switch makes a substantial difference, then it's a hardware issue, though not necessarily in the switch - it may also be the Terastation.

Without wishing to be seen to cast aspersions, the Buffalo Terastation is built to a budget - around $2.45 in resistors, transistors, and solder. It's entirely possible that the signal-level voltages given off by that thing are not considered acceptable by the new switch, whose standards are stricter, but were OK as far as the old switch was concerned.

Otherwise, it could indeed be the new switch. Unlike a "hub", switches are actually relatively sophisticated bits of kit which understand MAC (hardware) addresses and keep internal tabs on which MAC address is to be found on which switch port. When it notices two of those addresses attempting to talk to each other, a switch sets up a temporary link between the ports in question. It's far from a dumb amplifier, and things can go wrong.

I'd suggest borrowing a 3rd switch. Hell, I'd gladly give you one if you lived closer, just to get rid of some hardware and create space! If the third switch also refuses to acknowledge the existence of your "problem" Terastation, that just about seals it.

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i will most likely buy either of those, i cant find out how they work with internet. does the ethernet from the modem plug into just any of the 16 ports? because it doesnt have an internet input jack. just 16 ports. sometimes i will be using all 16 for lan parties, where we dont require internet but it would be nice for when we have ports open, to plug into the internet. thanks for anyone time spent answering me ;-)

Answer:Solved: 16 port switch question

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I'm looking for a switch that has 10+ ports and has DHCP.
I need one for a LAN party. DHCP seems to need little configuration, so its sort of like plug and play. What switch do you recommend that meet my criteria?
Also, is there anything specific I need to know about setting up properly?


Answer:10+ port switch with DHCP?

You can pickup a 16-port gig switch or fast (100mbps) and then put all those boxes on static IP and the default gateway can be the lead PC. This way you don't need DHCP if your just doing a LAN Party and not a WAN to LAN Party. If you're doing WAN to LAN party then pickup a Wireless N/Gig Router and connect that into 16-port gig switch. Leave the IP address set to Obtain and then you would be good to go.

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In my quest to figure out vlans today... This book im reading refers to switch ports as having more that one device attached to them in some situations.

Im wondering what are some of the more common port configurations for
a "single port" on a multi-port switch. Im not referring to the root ports or ports that are used to connect to other layer 2 or 3 devices for redundancy. But for some reason.. I always think of one node as connected to a port switch and thats it, (a printer perhaps, one pc, or a server etc) creating just one segment. I just figured that on big switches, there would be enough ports for dedicating one device per port.

So what Im looking for... is when people talk about having more that one device per port (on a switch)... do you know what there referring to exactly? Or are they just really saying that in some cases a single port can support "multiple devices" by actually connecting to another hub, bridge, or switch and its devices (and the mac addresses which would be added to that specific port ( routing table)? Im just trying to make sure im not overlooking anything

Any tips would be great. thanks much.

Answer:Solved: layer 2 or 3 switch "port" question

Trunk ports. What you're referring to is fairly correct in that you would typically see that with hubs/other switches/etc.

A VLAN tagged [trunk] port can carry multiple VLANs of traffic at Layer2. So you can have logical separation over one physical port.

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Need to no if I have this right

they have a dsl modem going to a Linksys router to a 24 port switch then to a little 4 port switch. sure, so then Would it be modem to router then router to any port on the big switch or is there an uplink port on the big switch it should go to? then you would hook a cat5e from one of the regular ports on the 24 port switch and run it to the uplink port on the 4 port switch need to no if the whole sequence is right. Hope someone can help, john will told me the cable would go from the big switch to the uplink on the small switch but I am wondering if I have it all right or not and wonderiing about from the router to the 24 port switch does the cable just go in a regular port in the big switch or if there is an uplink port does it go there. Hope you can understand my rambleing here. Thanks (please don't send me to a link) just need to no modem to router to regular port or uplink port on 24 port switch then from regular port on 24 port switch to uplink port on the 4 port switch. Thanks

Answer:Solved: Windows xp hookup question for modem, router, switch, to switch?

Router to uplink port on 24 port switch, and then normal port on the 24 port switch to uplink port on the second 4 port switch. An auto-MDX port on a device negates the need to worry about uplink ports for that particular cable connection.

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Question: DHCP Help Question

I'm running a 2003 server that is my internet gateway. Is there a way to make my DHCP show me which computers are online actually using the IP's it's given that particular device? I thought it used to do this, but it appears as though it no longer does.

Any solutions to this?

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Question: DHCP Question

Hi All-
I have several computers that were given to me from my mom's work. I have them all networked in my shop. I ran a cable upstairs to my router (connected to cable modem) so I could have internet in the basement. I got internet working fine on 3 of the computers and they all are getting IP addresses from the router (
Anyway, for some reason, 2 of the computers do not get an IP. In winipcfg, it shows the DHCP Server as, which is the IP of one of the servers at my mom's office. The computers that do get internet show the DHCP Server as, my router's IP.
Is there a way to remove the old DHCP Server IP from these 2 computers so I can get an IP and internet connection?
Any suggestions will be appreciated.

Answer:DHCP Question

Sounds like you have 2 DHCP servers, disable the 10.10.x.x one.

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Question: DHCP question

I have a router doing DHCP the router ip is I want to setup my server with static ip adress then setup my server to do DHCP scope from to 192.168.120 for some devices that need static ip adress can this be done ?

Answer:DHCP question

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Question: DHCP Question

Supposely it's better to assign static ip to a client rather than do it automatically. Any reason why?

Answer:DHCP Question

For "clients" not really. DHCP is a lot easier to do an maintain. You really only need to staticllyllylylylyy (can't spell) assign an IP usuallly in if its hosting something or providing some service to the network and is connected to by that known IP address.

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Hi all, so here is the situation, I have a Belkin N1 ADSL2+ Wifi Router/Modem, a PC on an N1 wireless PCI card, a Laptop on an internal 54g wireless card and a Nintendo Wii. The network is running just fine with WPA2-PSK encryption.Now Im upgrading my mobile to an Orange 6301 which has UMA and Im beginning to wonder if I should create a DMZ for that to connect to the network so I dont have to insert my (hidden) SSID and PSK into the phone.My router segregates the DMZ by IP address not MAC address, but if the DHCP issues the IP addresses 'Dynamically' how would I be able to ensure only the mobile phone hits the DMZ IP and no other device? Or when using a DMZ must static IP addresses be used?Thanks.

Answer:DHCP DMZ UMA question

A DMZ (demilitarized zone) is to have a computer outside of your routers firewall - so the internet can have access to it, a web server for example.If your home wireless network has encryption you would need to enter the PSK to access it so you can use UMA.When using DMZ a static IP must be used yes, but this is not with solve your problem. Your wireless network cannnot have 1 part encrypted and 1 part open.

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Question: DHCP question

What does it mean when it's said, "set your IP addresses as reserved (fixed) IP addresses outside of the routers DHCP address pool?"
I have an Asus RT-AC87U and have set up a few devices for static IP's but I'm not sure which addresses would be considered outside of the DHCP address pool.

Answer:DHCP question

You would need to access your router's DHCP configuration to see what range of addresses it uses for distribution.
If you set static addresses within the DHCP range then DHCP issues an identical address, you get duplicate address errors and associated problems from that.

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Question: DHCP/DNS question

I have a domain controller that is also handing out DHCP addresses. I'm finding that non-domain joined devices... pc's, tablets, printers, etc... are not showing in DNS.

Its been quite some time since I've configured DHCP, but I swore I remember an option to automatically create a DNS record when a lease is given.


Answer:DHCP/DNS question

Install/Enable WINS.

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Question: DHCP question

ipconfig/all shows that DHCP is NOT enabled.

Yet I have every thing set to Obtain IP addresses automatically in both my Ethernet adapter and wifi. In IPv4 and 6.

There is also no IP address listed in ipconfig/all for Default Gateway.

In the adapter properties I have everything checked except:

File and Printer Sharing for Microsoft Networks

Microsoft Network Adapter Multiplexor Protocol

By the way, I can browse and ping both nameservers and Ip addresses.

Any help would be greatly appreciated!


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Question: DHCP Question

Hello all,

I have a question regarding DHCP and how its configured to dish out the address for the DNS server. Ive seen how to setup a pool for it to issue IP addresses to the clients. But how can you get it to push DNS settings out as well on a basic router. Not something highend like a cisco. But maybe like a linksys or netgear... Something that people would have in homes or small business.

Answer:DHCP Question

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Question: DHCP question

Hi all,

I'm looking at the DHCP and i notice that the Lease Expiration is within a week and a half; what happens when it does expire and how do I renew this? Thank you in advance for your help.


Answer:DHCP question

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Question: DHCP Question?

How can you run an DHCP server on a router that is set up as DHCP as well? This can't be done can it? For example, the router I have is set up as running DHCP, thus I wouldn't be able to run a DHCP server on that router would I?

Answer:DHCP Question?

having 2 DHCP servers in the same broadcast domain will produce unexpected results

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One question I need to know

If you go from DSL modem to Router then Router to switch
my question is then
If I wanted to hook another mini linksys switch into the bigger switch would you run the cat5e cable from the first switch to a reg port in the second switch or would you run it to the uplink port and then hook the 1 or 2 computers into the reg ports of the second switch.??

Answer:Solved: Windows xp-question of hookup switch to switch?

Obviously, run it to the uplink port if available.

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Hello all,

My situation - I have a cable modem linked to a switch, linked to 2 desktops. My ISP gives both computers an unique external IP via DHCP.
Since I have to use DHCP to obtain the IPs Im unable to assign additional (internal) IPs via Windows XP TCP/IP config. (the option greys out when DHCP is selected). So, when i need to access my other computer i need to manually create the private network by removing the DHCP settings and by doing this i naturally lose my Internet connection.

I figured out there must be a solution to this because i was able to have internal & external IPs simultaneously by manually entering the contemporary DHCP settings. But manually updating the IPs lease by lease is something im not willing to do.

In a nutshell:
Is there a way to keep the connection use DHCP and still be able to use static IPs for LAN?

Both boxes are running Win XP SP2.

- Thanks in advance for any answers, Anz

Answer:DHCP/Internal IP question

Is buying a router an option?

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I would assume I just can't disable DHCP but is there a way where I can MAC filter my LAN so that every machine on the LAN must have their MAC address (wired) staticly set on Smoothwall in order to route traffic anywhere? In other words, you can't just come to my home with any old machine, plug it in and obtain a routable IP address to surf green clients or external networks.

Anyone know how this is done in Smoothwall?

Answer:Smoothwall DHCP Question

Yes you can just disable DHCP.

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Hey guys,
Have a question about a DHCP server configured within Windows Server 2003. I currently have it configured properly, using address range 192.168.1.n, but we've changed our mind and need to create another DHCP scope; one for computers that need Internet and the other for computers that don't need Internet. However, they all need to be able to communicate together on the LAN.
So, I've gone in and created another scope, using address range 192.168.2.n, obviously on the same subnet. But, other than doing reserved address for all of the computers, how do I tell a computer to connect to a certain scope?
I've googled, but I've been unsuccessful so far.


Answer:DHCP scope question

By the way, there is only this one DHCP server with one NIC in operation right now. It has another available NIC, though. All of the computers are hooked to the same switch.

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I'm studying basic networking, and I understand what a DNS server does, and I also understand what a DHCP server does. I only understand them in terms of my cable internet provider, though. In terms of commercial networking, I don't understand why a business or company would need an internal DNS or DHCP server. Why do they? Thanks..

Answer:DNS/DHCP server question

A lot of reasons.

If you have 500 different PCs in your company, will you run around to each one and assign them all static IPs?

And DNS is needed to locate internal resources. Your ISP's DNS won't know what IP "Downstairs_HP_LJ" printer is.

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sum1 help, i just setup my moms new computer, everything was working fine, then i leave to go back home across the country and she calls me and says her internet isnt working... i try to get her to ipconfig it and /release and /renew but when she trys to release the ip she gets this:::

all adapters bound to DHCP do not have DHCP addresses the addresses were automatically configured and cannot be released.

the other computer that is on the same router is working fine, with the same configuration i setup....

the only other thing i had her check was that her TCP/IP settings in windows were all set to automatic (IP and DNS)

normally i would just puts on her computer until i figured it out, but im across the country, and dont know what to do.

ooo yeah, the setup is (2) win2k computers on a linksys router, nothing fancy just file sharing and DSL.


Answer:router/dsl/dhcp question...

Shot in the dark but worth the shot. Go get Spybot, update the definitions and run it. I had a user a couple of weeks ago that could not get an IP. I tooled around and was ready to reload, gave spybot a shot just to see what I'd find and about half way through the app asked if it could "repair my network settings". Let it and it fixed the problem. Beyond that, removing TCP/IP and probably the NIC as well, then letting windows pick the NIC back up.

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It's my understanding that when a client requests an IP ( for the first time, DHCPDISCOVER ), it does so over the broadcast address ( ).

Would this be accurate? I'm trying to write some firewall rules, remotely, that will allow the dhcpd requests through.


Answer:Quick dhcp question:

The client wouldn't use as the dhcp server address since it has no idea of what network it is on until it receives information from the dhcp server. Here is a basic overview of dhcp. It says a client uses as the source address and as the destination.

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Our network consists of 4 PCs running XP Pro, 2 Macs running OSX and OS9, 2 PC's set up for wireless, and 6 printers. We were hooked up to the internet via a T1 line but because of the number of phone lines, our connection was too slow. We switched to a cable modem today. Previously we ran from the switch to the wireless to the router and then out to the T1, but the cable guy suggested we run from the cable modem to the wireless to the router to the switch. Is this more appropriate (changing positions of the wireless and hardwired router)? And how does that affect IP addresses, subnet masks, etc.? Which is the Default Gateway?
Previously we had a problem with IP addressing because of a test network set up on an old server by a consultant with DHCP running thru the server AND the router. Is it possible to have DHCP set up on the router even if the wireless is between the router and the modem? Also, when I direct connect a laptop to the cable modem and do an auto IP address, the subnet mask comes up with Normally our's is Does this present any type of a problem. One more thing, does the router handle DNS or do I need to have that set up on the server instead?
Don't know if it's important, but we have a dynamic IP address from the ISP. Would there be any reason why we should have a static IP?

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I have a friend with a big farm. He was struggling to get a signal from his BT Router.

I therefore suggested he buy 2 of these

Using this excellent article

I managed to connect the two routers, gave the 2 routers different SSIDs and the occupants can now wander about with a laptop and switch from one SSID to another. All well all good.

He's now called me again to say that his son is complaining about a weak signal at the very back of the house and can I add another router.

My query is, what do I have to do to connect the 3rd Router as regards setting the IP Range / DHCP etc?

I hope to be able to wire the new (identical) third router to the second via LAN Port

Really grateful for any help.

Answer:Three identical Routers, DHCP question

You need to set the LAN address of the new router to an address that is within the sub-net mask range of the network, has not been assigned to another device, and is outside the DHCP range of the first router. The DHCP server is turned off on the new third router. The LAN port on the new router can then connect to an open LAN port on either the first or second router. Using the example addresses in your links, a suitable address for the new router could be

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alright, pertinent details

(ips changed blah blah)

main network is
increasing wifi coverage, need to setup DHCP(no dhcp currently, dont ask, not my call)
would like to do this on

I have a cisco 2911 at .1.2
and a fortigate 60c at 1.4

the 60c sits between the network, and the internet doing its job as a UTM and handling a few P2P vpn's, the cisco has some T1's to other offices into it

I gave the fortigate a secondary IP of .2.4 and set a DHCP pool on the internal interface to hand out .2.100-.2.150

it will not work. the 2911 has a route that points to the 60C, I added a route in for 232.0 on it to point at .1.4 as a test and it did not help.

the 60c and 2911 are not directly connected, but both go to the same switch

the device that I am trying to get DHCP is attached to a different switch, which is on a 10gb link to the other one. if I put DHCP on .1.0 it works just fine so its not the 60cs dhcp server just not working.

I am just missing something. and I am not sure what

its making me feel very silly. if it was easier to do so I would just give all my .1 stuff a subnet of .254.0 but since its about 150 devices on static ip's thats a huge undertaking I am trying to avoid(and I think that would fix the issue?)

Answer:routing/subnetting question with DHCP

you will need to use an ip helper address in order to provide dhcp to another subnet because a couple steps in the dhcp process uses broadcast and broadcast traffic does not get routed.

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At the moment, my Internet connection (Rogers highspeed) goes through a BEFSR41 router and from there to my computers, I'm going to be getting a wireless device and bought a WRT54G router to act as an access point. Fairly straightforwards, just disable DHCP on the 54G and change its local IP...right?

Well. What I want to do is a little more complicated.

Due to the firmware version I'm running on the BEFSR41, I cannot have both port forwarding and DHCP enabled on it at the same time. Since I need port forwarding, I have to disable the DHCP server, and here's where the fun begins. I was thinking that with getting a second router, I could use its DHCP server and just have it hand out the appropriate settings to connect through my first router...

So I set it up, noticing that there was no option to choose a gateway IP address to assign and crossed my fingers. It didn't work, the computer got a DHCP assigned address in the right range, with the right subnet mask and DNS servers...but the default gateway was that of the 54G, not the BEFSR which is where my 'net connection enters.

It is a physical impossibility to use the 54G as my primary router due to the network topology (cable enters in the basement, wireless access point needs to be on first floor.)

Is there any way to work around the problem with the gateway IP address being handed out by the 54G?

IPCONFIG with DHCP enabled, note the wrong gateway.
Connection-specific DNS Suffix . :
IP Address. .... Read more

Answer:WRT54G DHCP configuration question

Why not just replcate the old one with the new? Will the signal not go through the floor?

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I am trying to use a Netgear WNR3500 wireless as a wireless access point on my network.

I have attached two screenshots from the main 2WIRE AT&T U-Verse wireless router. I am trying to determine the DHCP IP range of the 2WIRE AT&T router.

Screenshot #1 shows Status under the LAN tab: Private Network DHCP Info -

Screenshot #2 shows DHCP under the LAN tab: DHCP Network Range - (default)

Can someone please tell me which DHCP IP range I should use. I need to set the IP address of the Netgear router to an IP outside the DHCP range.

Thanks! Bill

Answer:Router DHCP IP Range Question

1) You can leave the 2WIRE settings alone.
2) Connect to the Netgear WNR3500
3) Disable DHCP
4) Connect the WNR3500 and the 2WIRE as shown in step 4 on this website:
How do I set up a router as a wireless access point? ? ask4 Portal
Where that image shows a wall jack...
...that would be one of the ports on your 2WIRE router.

And of course you can use Wi-Fi instead of a LAN cable to connect the computer to the WNR3500 for day to day surfing, but you might not be able to configure the WNR3500 via that connection. More on that later.

The 2WIRE router will issue all of the IP addresses for your network. Once you connect to the WNR3500 via Wi-Fi, your connection will be forwarded to the 2WIRE for it to hand out an IP address.
To answer your question more directly, the DHCP IP Range is shown in screenshot #1. Screenshot #2 is showing the starting IP and a thing called a submask ( That does define the starting and ending numbers for a network, but it is not the same thing as the range of IP addresses that the DHCP service will dole out.

>> I need to set the IP address of the Netgear router to an IP outside the DHCP range.
Some 2WIRE routers will not accept traffic from an IP address that are outside of the DHCP range unless you also set some things up in the router for that IP. So once you get this all hooked up, you might not be able to "surf" to the WNR3500's configuration interface. Also, you might need to look around in the 2WIRE interface to... Read more

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I can't believe I"m having hard time with this, it's one of those wtf days today.

This is being done in a lab for some testing purposes, but the simple **** is driving me insane

Two routers, cisco 1700 , behind them a hardware firewall in each end doing site to site VPN , each "site" has of course its own subnet , everything is allowed between sites as it's wrapped in VPN packets and there are no filters on that traffic , connection is T1's out to the internet from the 1700 routers.

Main site has a DHCP server (2003 box) , DHCP is configured with scopes for all subnets, locally in the mian site it works perfect, but remote sites cannot get DHCP to them from this box.

Now I believe both cisco routers require a DHCP relay agent to pass DHCP requests/replies between the different subnets , correct ?

If so, how should it be configured? I can't find much useful info on the net, I do NOT want the routers to do DHCP, I only want them to pass the info between subnets as needed.


Answer:Cisco DHCP relay question

Under the interface:
ip helper-address a.b.c.d

where a.b.c.d is the IP address of the DHCP server.

That will do DHCP relay.

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I have a quick and painless question.How do you set up DHCP client on an interface on a router (In my case a 2620). I remember it being simply "ip address dhcp", but my router is not accepting that command and when I use the help command it tells me I must put in a host address. Is there something I am missing. Do I need a newer IOS, I am running 12.0(3)T3 . Thank you all for your time and any tips.

Answer:Cisco DHCP Client Question?

I guess your not enterning the command in the right place. This should help : -

Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface e0
Router(config-if)#ip address dhcp

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So I've been getting ddosed recently and my ISP will not change my IP, they've told me to shut off my modem/router it's a 2 & 1 for 5 mins/hour, I've done that.

My DHCP Lease Time is 24hrs, could I make it 1 hour and shut off my router for 1 hour and have a new IP? Can anyone explain this to me?

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Option 61 of DHCP reports client identifier information. Does anyone know how to turn this on in Windows XP? I can't seem to find information anywhere about it.

Thanks in advance.


Answer:Microsoft DHCP - Option 61 question

Here's a little reading, maybe this will help...



and HERE

and maybe not....

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I have a standard connection, all connected up using another cisco device 1800 series.
But, well, I'm doing some lab training, and well, im used to using linux as routers, and my cisco skills isnt the best in the world either.
just tired of big boxes doing the routing, and planning to switch it out, but the 1800 is used as a switch >_< and testing out on the old 831 first.
ios running on the 1800= newest.
ios running on the c831= 12.3
The scenario is:"System image file is "flash:c831-123-7.T6.bin"

Modem(Bridge)->Router(C831)->devices. dhcp range excluded others.
I connected 3 devices, a wlan access point, a "server" and a computer.

If i want my server and access point to utilize the dhcp service and to get a ip like for access point. for the "server"
and the computer will get a dhcp whitin the dhcp range 100-200.

How to i configure dhcp leases to a specific mac address to be and such on cisco routers?

2nd question, how to route so my modem is able to be connected inside the nat using C class ip ranges.

IT gets pat, nat, dhcp, wan, lan, dhcp range, ssh all that have i configured up.

Answer:Cisco IOS Dhcp+routing question.

Here's the normal pool and excluded addresses:

ip dhcp pool WIRELESS
dns-server 65.32.1.x 65.32.1.x
ip dhcp excluded-address
Here's a reserved address:

ip dhcp pool LAPTOP
hardware-address 000c.29d7.e6c7


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I'm trying to join a domain from a member server and receive a dynamic IP from the domain controller.

DNS & DHCP are setup on the domain controller.

I was able to join the domain with the member server using a static ip, but I need the member server to acquire an ip from the DHCP server (

I'm seriously stumped and have searched with no luck.

What am I missing??

Answer:member server dhcp ip question

Create a DHCP "Reservation"....follow the wizard for making one in your DHCP services manager. You enter the MAC address of the computer you wish to have a reservation for...give it a name..and assign the IP you wish it to get.

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Hey Guys,

I have been messing around with Apache from (XAMPP) on my Windows computer. I know that it is not secure, but I am just testing it for right now (for fun).

I am behind a Linksys WRT54g router. I can easily access the apache server from internally (locally), and in order for me to be able to access it externally (external IP in address bar), I have to port forward in my router.

So, I port forwarded port 80 and everything worked fine. I just had a question about this.

Since most internet (HTTP) traffic is served through 80, and I just port forwarded 80 to one computer, how do the other computers on my network still have access to the net. Don't get me wrong, it's awesome that this works, but I would just like to know how. Theoretically, wouldn't all the traffic that is coming through 80 be routed to that one computer?

Can someone explain this to me?

Also, when people use Apache to host sites, do they usually keep the apache ServerName (in httpd.conf) at localhost, or do they change it to a different IP? I would imagine they would keep it at localhost, so what would be the reason for changing that to a different IP?


Answer:Question about port forwarding port 80 (for apache) and a couple other questions

Anyone have any ideas? Thanks.

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Is the number of DHCP pools limited only by the amount of RAM or is there a set limit you can have depending on the router model?

Answer:Cisco router question (DHCP Server)

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Hello, I have virtual wifi miniport active through nesth, I use it to share internet to my Nintendo 3ds but I can not share it with my Nintendo Ds, after reading and found that the virtual miniport wifi dhcp not active, I wonder if there is any way to enable the miniport dhcp, I have been sharing internet through mac OS x Snow Leopard but I work on both Windows and Mac OS, while I like to play while completing the build process.

Any help is truly appreciated.

Answer:Virtual Wifi Miniport, dhcp question.

You should be able to turn on DHCP the same way that you can on a regular NIC. Go to the Network and Sharing Center, then look left to "Change Adaptor Settings" and click that, highlight and right click the Virtual adaptor and choose properties, then right click TCP/IPv4, choose properties again, make sure that the upper dot is set to "Obtain an IP address Automatically, same for DNS.

Windows 7 Tip of the Week: Use Wireless Hosted Networking to Share An Internet Connection Wirelessly | FAQ/Tip content from Paul Thurrott's SuperSite for Windows

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We are in need of some serious help here.

We are having issues giving IP's to both motorola modems and then the actual clients behind them at a remote location. We got motorola coming in to ensure the BSR1000 we have handling the cable internet in a particular area is setup correctly but we are having to use a Windows 2000 Server to do the DHCP on that end for that area. (This is a Wireless Internet Service provider). Since switching to fibre we've had a heck of time with the 3 Class C IP ranges we got from them. Spent 2 days setting up a openBSD server on our main office end but I am having issues figuring to how to get the Windows 2000 Server to give DHCP for on a subnet (for these motorola modems) and then the computer IPs for the subnet.. something about BOOTP relaying maybe? NBever had to set that up. Can it all be done with the one server? Or should I set the motorolas to be on something like subnet so we won't need to relay over the 2 subnets... anyways nothing is getting an IP address at the moment.

Please keep in mind if any of this makes no sense it's probably cause after only 6 hours sleep since Friday... I think I'm seeing stars..


Oh we gave the DHCP Windows 2000 Server the IP of on the subnet... if that helps

Answer:DHCP Relaying over 2 subnets.. advanced question

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When I try to join a computer to the domain orderdis.local (or, get this error:

Note: This information is intended for a network administrator. If you are not your network's administrator, notify the administrator that you received this information, which has been recorded in the file C:\WINDOWS\debug\dcdiag.txt.

The following error occurred when DNS was queried for the service location (SRV) resource record used to locate a domain controller for domain orderdis.local:

The error was: "DNS name does not exist."
(error code 0x0000232B RCODE_NAME_ERROR)

The query was for the SRV record for _ldap._tcp.dc._msdcs.orderdis.local

Common causes of this error include the following:

- The DNS SRV record is not registered in DNS.

- One or more of the following zones do not include delegation to its child zone:

. (the root zone)

For information about correcting this problem, click Help.Click to expand...

At first, DHCP was set to have it tell clients to use as DNS. Then, I corrected this to (the IP address of the Windows Server 2008 R2 x64 box). This server has DHCP, Active Directory Domain Services, DNS (installed by ADDS), File Services, Print and Document Services, Windows Server Update Services, and an feature WINS that I installed (because previous Linux box had this defined when handing out DHCP leases).

The server itself is configured to use 1... Read more

Answer:Question regarding 2008 R2 DHCP+DNS+AD; can't join domain

DNS Servers should point to their own internal IP (loopback normally)

If you get not internet when you do this then your DNS server is not working.

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Hey guys, to get more understanding on DHCP/WINS and DNS, I've decided to create a 'ACME' company in my virtual lab.

I am going to be making 2-3 sites and I know I need a Domain Controller on each site but I am wondering how would configuring DNS/DHCP and WINS work.

If I have 3 different sites under the same domain, can I use 1 server per site as a DHCP/WINS/DNS server? or would it not be wise to do that and just have 3 separate servers peer site, each server having the its own separate role?
I've been thinking about this for a bit and to make it cost effective for 'ACME', I would assume that I would use 1 server per site with it running the 3 roles. Less hardware needed to purchase which would be a positive thing.

What do you guys think? am I on the right path? I'd like to plan out this topology first to get an understanding before I actually start configuring the server(s) in VMware.

Answer:Question on creating DNS/DHCP/WINS servers for a lab enviroment

I'd just put them all on the DCs, no real reason not to. I wouldn't bother with WINS unless you absolutely need to have it, AD doesn't need it.

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Hi everyone, I searched through the forums but couldn't really find what I was looking for.

Currently we have a DHCP server set up to a switch, that has a special line connecting to a switch in our shop which is just across our back lot, giving network access to the few computers over there. They recently put in a new machine that needs network access, but they have already accidentally cut two ethernet cords. I'm looking to provide a wireless solution for the machine, but I don't want to have to spend a few thousand dollars on a large wireless switch.

Can I plug a wireless router into the switch in our shop, and essentially turn it into a wireless bridge, or is there another, simpler way to do this?

If this has already been answered, sorry for missing it!


Answer:Solved: DHCP Server -> Switch -> Switch -> Wireless

While you could use a router, or even configure the router to act as an access point, why not just buy a true access point? They start at $27:

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I need to upgrade my 5 port router to a 20 port router. But I am having problems with the 20 port. It seems that the UdpD packets are not going thru. The settings seem to be the same as the 5 port. And I know the 20 port is fine. I have tried different ones.

Does anyone have any experience with these? Or had possibly run into this problem in the past?

Due to other reasons using a different router is really not an option.

Answer:Question on Dlink 5 port to 20 port router.

couldnt you have just added a switch?

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I have dsl router going to a dell gigabit switch and in one room I have a hub (because I ran out of jacks) and the everything in that room has a ton of problems.

If I get another switch to replace the hub, will it hand out IP's (i am running DHCP through the router) or will the router be able to manage both switches?

Are the dell switches any good? They have an 8 port for $54.

Answer:Hub or Switch Question

Sounds like you may be getting some collisions on your hub, going to a switch may more than likely resolve your problems, but I would look to see whats causeing the problem to begin with. Disconnect one machine at a time and check to see if your problems persist. It may be one machine broadcasting traffic that's killing the whole segment.

Hubs broadcast traffic to every device that they are connected to, switches only broadcast to the machine that is intended to recieve said info.

I have simplified this greatly, but I would never, ever, never again use a hub after moving to a switched network.

Just my 1/2 cent on this.


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I was wondering if anyone knows if the vga portion of an electronic kvm switch would work in reverse? Instead of 2 pc's sharing a single monitor, could it work by allowing one pc to switch between 2 monitors? Or if there is a better solution to achieve this? I need to be able to use one or the other or both monitors.:wave:

Answer:Kvm Switch Question

A better way to accomplish this is to purchase a video card that has 2 outputs

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I just installed a Emine 2-Port PS/2 KVM Switch w/Cables on my xp pcsnow when I start and switch over to the second pc it switches over ok, but ALL I get is all my programs come up In Notepad as .exe'sI cannot start anything it just keeps bringing up Notepad.ex'sIt is a clean pc(no virus's etc) and it was running pefectly before hooking up the kvm switch.Can anyone enlighten me as to what could be wrong, is the switch no good?

Answer:KVM Switch Question?

I run a KVM, and I can't see how it could be the cause of your issues, unless a defective one could be seriously messing up the keyboard or mouse inputs. But I still don't see what kind of KB or mouse input would explain that behavior.Did you receive a driver disk with it? I wonder if you got a counterfeit one with malware. Mine uses no driver. Just hook up and it works.What happens if you remove the KVM and just switch your mouse, keyboard, and monitor manually between them? Do both computers work okay without the KVM?Just for fun, try to right click on one of the .exe's for the Properties box. Does it show Notepad as the default application to open it?

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Question: Switch question

I currently use this switch:

With all the additional things on the network, I need more, so I picked up this:

My question is, if I still use the 5 port in my living room (main rig, htpc, dish receiver, and a spare), will it compromise my network transfers?

Basically it would be router >16 port >upstairs, WHS, bedroom, PBO Core> (5 port)>main rig, htpc, receiver.

Answer:Switch question

they are both gigabit so I don't see why one would be slower then the other. You shouldn't see any speed decrease.

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Hey guys,

Ive got one monitor that i would like to share between my laptop and my other PC. When i use it with my laptop id like to use it as a 2nd screen and with my pc id like to use it as the main screen.

I bought one of these:

CBL-102U 2-Port Mini KVM Switch with Cable

I connect the main adaptor (or the box) part to the shared screen. Then i hook one end of the VGA cable to my laptop and the other end to my other PC output..right?

I turn on my laptop and the screen and try the screen setting to extend monitor but nothing. Also tried using the function key on my laptop with the screen switch button - nothing happens

The only thing i get is a red flashing light on the PS1 light on the box, thats it. Do you need to have the PS mouse & keyboard plugged in order for the VGA to work??


Answer:KVM switch question


When i use it with my laptop id like to use it as a 2nd screen and with my pc id like to use it as the main screen.

You would go out of the shared monitor into KVM and then out of the KVM into the laptop's VGA. And Into the Desktop's VGA. And Yes, the USB Keyboard and mouse must be plugged into the KVM and the output would go to the laptop USB as well as the Desktop USB. The USB has to be plugged in for everything to work.
Once you switch the KVM to the laptop, Then you have to adjust the Display to Extend Desktop.

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Ok, I have a weird problem and it may sound simple to some. I have a laptop, Xbox 360, and sometimes a desktop (when I am repairing one) that I need to hook up to one monitor. I figured a KVM switch would be perfect but it gets its power from the USB/PS/2 port. Therefore, I am unable to use it as I will not be sharing a keyboard or mouse. I am unable to find one that actually has a power adapter (unless I overlooked it). I tried searching for a VGA Switch/splitter but I have only found one that would allow me to do what I need to do and the rest only allows you to connect one device and 4 monitors. Could someone recommend a cheap (under $75) KVM that has a power adapter or inform me of what I need to be looking for (like the correct words for the product that I need). Thanks in advance.

Answer:KVM/VGA Switch Question Try this

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i have an older belkin 4 port omnicube kvm switch that had 2 desktops & my old dell laptop conn.
i just got a new thinkpad with port rep
the port rep has only video in, no kb or mouse.
when i tried hook up video i got nothing on monitor.
should a kvm switch work in this config ( 2 desktops using kvm inputs, laptop using only v)
i did try direct conn from mon cable to port rep & it worked but not shure if kvm bad or its just not supposed to work in that config.

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Question: AT switch question

I need help. I just purchased an AT powersupply for an old computer. I was in a hurry and didnt read the box well. Its an AT powersupply that uses the motherboard switch. I need some ideas on how to wire it to the older exterior switch. The old switch has 2 brown wires and the new ps have 3 wires, red, black, and white. Any Ideas?

Answer:AT switch question

I have searched everywhere for a solution to a similar problem, but with no luck. The only way I could find to get around it, was to get hold of a new power supply. I hope you have more luck than me.

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I purchased a new Logiteck wirellees keyboard and mouse yesterday.
It has the usual buttons at the top including a PC switch off button. So last night instead of the usual Start/Turn Off
sequence I used the button. PC immediately switched off with no saving settings etc.
I wondered if I might have lost anything, but switching on the usual way just now the PC went straight into fully booted
with no boot up sequence and everything loaded.
So question is what mode does it go into via the keyboard and is it a risky manoevre.

Answer:PC Switch Off Question

Obviously not used to it yet.

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Question: Switch Question

Seeing how switches themselves do not have MAC addresses, when a computer on one switch wants to communicate with a computer that resides on another switch, wouldn't the 1st switch forward that frame to all nodes on it's own switch and then subsequently forward the frame to the switch with the computer with the frames corresponding MAC address? Seems to me that a switch would work like a hub in this type of scenario. Or does each switch have some sort of built in forwarding table?

Answer:Switch Question

In general switches (unmanaged/dumb) don't have MAC addresses unless they are managed or a layer 3 switch.

Yes, if the switch receives a frame with a destination MAC address it does not know about, it will forward that frame across all its ports. The chances of this happening is minimized as many computers/servers/devices will at least generate some traffic when it is first plugged into the network. When the particular computer/server/device generates traffic the switch will learn about the MAC address on that port. As you've said, once the switch has the MAC address in its MAC table for which port that MAC address resides on, all traffic will be directed to that port for that destination MAC address.

No, the switch is just broadcasting for this specific scenario. There are also ARP broadcasts which get generated by clients when there is a who is ARP request. Even when there is a broadcast like this, the reply message from a device will not be broadcasted across all the ports. The other thing that makes hubs hubs is how they function electrically. They act as a splitter. So the implication of this is that the devices connected to the hub HAVE to run in half duplex. Half duplex operation allows CSMA/CD to run which is the spec in ethernet to allow for collision detection. The way ethernet operates is that a device will listen on the wire before sending a frame. If there is traffic already on the wire, the device will wait a random amount of time before checking to ... Read more

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What are the requirements for Fedora 7, because the computer I plan to run it on isn't that good, but it runs well enough.

Answer:One question before I switch...

Hardware requirements:

Fedora 7 requires an Intel Pentium or better processor, and is optimized for Pentium 4 and later processors.

* Recommended for text-mode: 200 MHz Pentium-class or better
* Recommended for graphical: 400 MHz Pentium II or better
* Minimum RAM for text-mode: 128MiB
* Minimum RAM for graphical: 192MiB
* Recommended RAM for graphical: 256MiB Hard disk space

The disk space requirements listed below represent the disk space taken up by Fedora 7 after the installation is complete. However, additional disk space is required during the installation to support the installation environment. This additional disk space corresponds to the size of /Fedora/base/stage2.img on Installation Disc 1 plus the size of the files in /var/lib/rpm on the installed system.

In practical terms, additional space requirements may range from as little as 90 MiB for a minimal installation to as much as an additional 175 MiB for an "everything" installation. The complete packages can occupy over 9 GB of disk space.Click to expand...

In reality however - especially if you use Gnome or KDE - you'll get much better usability with 512 MB RAM, the more the better.

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I have the following environment:

Linksys wireless router connecting 4 computers.
The os's are windows 2000 pro, xp home, xp pro and 98se
The xp pro is my business dell notebook with a docking station.

My company wants to send me a 19 inch lcd monitor for it. That's fine by me. The 98se computer is also in my home office and it uses a 17 inch monitor that is the size of a small van.

So the question is this ....... Can I make this xp pro notebook with a docking station and the old win 98se computer share not only the new 19 inch lcd monitor but also the keyboard and mouse. The keyboard and mouse I'd like to share is currently hooked into the 98se machine and isn not usb. If so what kvm switch would you recommend? Also, when I'm traveling with my notebook would the 98 se machine still function ok?


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We are deploying 32bit and 64bit Win7 PCs here. I accidentally ran: BCDEDIT.EXE /Set IncreaseUserVa 3072 on a 64bit PC.

So, did I just restrict this PC to only using 3GB? And if I did, is there anything I can do to reverse it?

Thanks for any help!

Answer:3GB Switch Question


Try bcdedit /deletevalue increaseuserva 3072

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Question: Switch Question?

I recently ran into a problem in a peer-to-peer network (about 16 PC's) where one PC had completely stopped all network traffic including internet access (not one PC could see any thing). After unplugging the "bad" PC from the switch everything returned to normal. I checked out the "bad"PC and found it to have an HDD issue (sounds like a box of rocks and cant get past the windows boot screen, also BIOS wont recognize it most the time). The question I am getting to is this, arent switches supposed to stop these type network problems? Do they not provide a single path to another device for that session? Help understanding this would be appreciated. The switch is a CNET Power switch (CNSH-1600).

Answer:Switch Question?

Hi Stik62
That's not very reassuring to hear. I'm of the same opinion, that "switches" are usually advertised as being capable of isolating the port which is causing trouble. Try to duplicate the problem on a different switch-port. By swapping the port and duplicating the problem you are trying to prove that the original port has hardware integrity.(not broken). If the port's not broken, then the Techs at Cnet woulf love to hear the details. It'll help them build better boxes.

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Question: Switch question

I have two computers at home. One's my daughters and I have no need for them to be networked. I'm using comcast cable for internet access. I simply bought a small D-link 5 port switch and run the two computers thru it. I've been doing this for a little over three weeks. I told my brother about it so he ran off to Fry's to get one. The guys there scared him to death. Said it wasn't possbile to do and that comcast would be able to tell and wouldn't allow it.

Don't want to be doing anything illegal or at least get temporary turned off. It's working like a dream but whats the skinny?

Thanks Ed

Answer:Switch question

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I recently got ahold of a BayStack 301 Ethernet switch and I can't figure out how to connect my DSL modem to it and then get it to blast the signal out to my other computers. I tryed connecting the modem to it but I got no connection, the link lights where not lit. but it i put on a cable attatched to a computer it lights up the port. I dont have any software for this switch cuz I don't know if you need any. If anyone can help me with this it would be sweet. thanx. The only port that dosn't light up at all is port 1, is that a config prob or is port 1 just broke?

Answer:Switch Board Question

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If I have a broadband connection, a server with gigabyte nic, and I replace my 10/100 switch with a gigabyte one, will I see a noticeable increase in speed through remote desktop or internet throughput?

Answer:Gigabyte Switch Question

None at all. If you have local workstations sharing files you may see an improvement in access speeds locally. The 100mbit connection is far faster than your Internet connection already.

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I have a Motorola SBG6580. It's on one end of the living room, my computer is on the other end. The cable from port 1 on the SBG6580 is connected straight to my desktop (Cat6 cable is run under the baseboard). Port 2 will be for a HTPC, port 3 is for the blu-ray player, port 4 is empty.

Can I take the ethernet cable from the modem/router (port 1) connect it to a switch (Netgear GS105 5-port Gigabit switch) that's on my desk and use the switch to have multiple ports at my desk? Will I need to change any settings in the SBG6580 for this to work?

Answer:quick question about a switch

Quote: Originally Posted by HAVOC

I have a Motorola SBG6580. It's on one end of the living room, my computer is on the other end. The cable from port 1 on the SBG6580 is connected straight to my desktop (Cat6 cable is run under the baseboard). Port 2 will be for a HTPC, port 3 is for the blu-ray player, port 4 is empty.

Can I take the ethernet cable from the modem/router (port 1) connect it to a switch (Netgear GS105 5-port Gigabit switch) that's on my desk and use the switch to have multiple ports at my desk? Will I need to change any settings in the SGB6580 for this to work?

Yes that is exactly what switches are made for, no adjustment to the settings is required.

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I am going to host a LAN party soon and am new to the networking scene. I have a Linksys
WRT54GS wireless router which also has four ethernet ports on the back. The LAN would be small, myself and three friends at most, so I am not in need of a switch. Can I just hook up a the computers to the WRT54GS and not use a switch with a crossover cable? I have used the SEARCH FORUM tool and that has gotten me some answers about setting up a network, but am still unclear about actually setting it up the connections. Thanks a lot.

Answer:Quick LAN question about whether a switch is necessary.

The 4 ports on your router is a built-in switch.

So if it's only going to be you and 3 friends, then you'll be fine.

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Ok... So I bought a Compaq computer. It came with windows XP and a product key. But XP is only available on a recovery disc. I HATE my motherboard and was going to change it to an intel 865g chipset board. Now... I won't be able to reinstall my recovery cds over the new mobo right? If I can't, should I purchase a retail or OEM version of windows xp? Thanks.

Answer:XP, mobo switch question....

You already asked this question.

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Hey all. Quick question.
I'm new to networking. I'd like to expand my network (currently just 2 computers w/crossover cable). All it needs to do is play multiplayer games. Will a switch work or do I need a hub or a router? The switch was $10 so I bought it and before I open it I wanna know if it'll work. Thanks!

Answer:Quick Question Switch/Hub

Have used all three

Switch is better than hub
Router is better than switch

If you just want to play games on home lan switch should work fine

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so i bought myself a Netgear GS608 gigabit switch, so i plugged my switch into my router and my server, my download box and myNas all into the switch, port 1 where i plug my router to my switch is orange(10/100) and my port 3 and 4 NAS and Download box are both green(10/100/1000).

On the network connection on my NAS and Download box both say 1Gbps but yet transferring 40GB will take almost 3 hours i'm not sure why its not transferring faster.

Answer:Question about Gigabit Switch

About 4mb/sec is typical for most stand-alone NAS boxes. The gigabit port is strictly for advertising copy.

What's the exact make/model of the NAS box?

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I need to reset the passwords on some of our switches (2900XL) since the ones I have don't work. I just wanted to ask if the config is wiped out when I reset the switch, or just the password. I've tried to get on via the web interface, but can't seem to do it and the guy who set them up is long gone.

Answer:Cisco Switch Question

The standard IOS password recovery procedure simply lets you boot without loading the config. You then enable yourself, and copy the config into memory, change the password, and save the config.

The procedure for the 2900 seems similar..

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So, I just bought this 32 port and another 24 port switch for a big lan party i'm having....I managed to hook the two together via their uplink ports, and, well, when I plug my comp into one of the jacks, it says "limited or no connectivity" So, my question is, how would I configure the TCP/IP settings? I know the subnetmask is, and the ip address is 192.168.1.xx, but what about the default gateway and DNS servers? Do I put anything there? At the last LAN party I went to, I had this same problem and someone showed me how to do it, but I forgot Any help would be appreciated!

Answer:n00b switch question

Well first, don't set ANY of that manually. The router should assign you all the IP info. If that's not happening, DHCP is screwed up, or else you have a bad cable or bad port.
If other PCs connected can get dynamic info, so should you, or setting static info won't help.

Try a new cable, and a new port. Make sure your NIC settings are all set to auto, and make sure you don't have firewall software interfering.

Good luck!

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Relevance 59.45%

So, I just bought this 32 port and another 24 port switch for a big lan party i'm having....I managed to hook the two together via their uplink ports, and, well, when I plug my comp into one of the jacks, it says "limited or no connectivity" So, my question is, how would I configure the TCP/IP settings? I know the subnetmask is, and the ip address is 192.168.1.xx, but what about the default gateway and DNS servers? Do I put anything there? At the last LAN party I went to, I had this same problem and someone showed me how to do it, but I forgot Any help would be appreciated!

Answer:n00b switch question

You are going to need to setup a DHCP server to hand out address whether this is a simple router or an actual computer doing it.

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hey guys i have a quick question bout a situation i have going on. the computer i am now on is hooked up into the internet via a wall ethernet jack, which is hooked into an ethernet switch (or hub i think) in another room where the cable modem is located. the tv that i play my xbox 360 on is a good 10 feet away or so, and i want to get connected onto xbox live from there.

i have an ethernet cable that is long enough to run from the xbox itself to the wall ethernet jack that the computer is hooked into.

what my question is is that if i buy another ethernet switch and hook it into the wall jack, and then from that switch run another ethernet line into the computer which is literally right on top of the jack and then another line from that switch into the xbox 10 feet away, if this will work since the wall jack itself is hooked into another ethernet switch in another room.

i can kinda guess that was kinda annoying to follow but i just wanted to explain everything to avoid confusion. help would be really appreciated . thanks guys

Answer:ethernet switch question

im not sure if theres a difference between a hub and a switch, but i do know that the wall jack is hooked into an 8 port linksys ethernet switch. if that helps at all

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First of all, before you go and fork out the money for gigabit evaluate if you're even going to see an improvement.

What speed are your hard drives in your servers, and your controller card. Im assuming your servers are some form of SCSI. 160, 320?

Are you serving up anything else other than static webpages? Do you have any big databases that programs pull from? Multimedia?

The reason I ask is because is because most SCSI Ultra 160 drives out there are going to transfer data anywhere from 20MB/Sec to 50MB/Sec. It depends on your particular drive and where that data is on the platter and what (if any) RAID type you're running. I've seen 320 drives than can transfer as fast as 80MB/Sec, but I'm sure there are faster.

100Mb Ethernet=12.5MB/Sec (Theoretical Max)
1000Mb (Gig)Ethernet=125MB/Sec (Theoretical Max)

So dont assume that just by getting GigE you're going to see a massive performance increase hitting your servers. Its going to come down to the hardware on those servers and your access patterns. If you're running old stuff and just serving up 50-100kb websites all day long, you'd probably be better off going with 100mb and perhaps doing Link Aggregation across two links or doing DNS load balancing IF you need it. Your bottleneck here is probably going to be the server, not the network. Having GigE to the servers will however make sure that all the data requests make it to the server (in the case that 100Mb ethernet would be ... Read more

Answer:gigabit switch question...

Originally posted by Boscoh

First of all, before you go and fork out the money for gigabit evaluate if you're even going to see an improvement.

What speed are your hard drives in your servers, and your controller card. Im assuming your servers are some form of SCSI. 160, 320?

Are you serving up anything else other than static webpages? Do you have any big databases that programs pull from? Multimedia?

The reason I ask is because is because most SCSI Ultra 160 drives out there are going to transfer data anywhere from 20MB/Sec to 50MB/Sec. It depends on your particular drive and where that data is on the platter and what (if any) RAID type you're running. I've seen 320 drives than can transfer as fast as 80MB/Sec, but I'm sure there are faster.

100Mb Ethernet=12.5MB/Sec (Theoretical Max)
1000Mb (Gig)Ethernet=125MB/Sec (Theoretical Max)

So dont assume that just by getting GigE you're going to see a massive performance increase hitting your servers. Its going to come down to the hardware on those servers and your access patterns. If you're running old stuff and just serving up 50-100kb websites all day long, you'd probably be better off going with 100mb and perhaps doing Link Aggregation across two links or doing DNS load balancing IF you need it. Your bottleneck here is probably going to be the server, not the network. Having GigE to the servers will however make sure that all the data requests make it to the server (in the case ... Read more

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Hey all.. I have a new power supply that I havent install yet, it has a power switch on the back of it, but my old PSU doesnt, it just turns on when I hit the power button on the front of comp.. If I leave my new psu switch to on, will it still safely shut down and start up by using the power switch on the front of comp? Or do I have to manually turn my comp on and off from the psu (back of comp). Also, whats the difference on the switch that says 115v and 230v, Its set at 115v I believe.. Thanks!


Answer:Psu Power Switch Question

You don't have to switch off the PSU in the back of your computer on a standard shutdown. Turn it off if you're unplugging your computer or doing anything with the hardware.

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I have a network I setup for my dad with a a rotuer that runs to a second router to provide intenet to a room in the house that can't get wifi

It stopped working today, So I added a switch to the set up.

Why does it work that the modem to the switch to the router, and not from the modem to the router?

Answer:A router and switch question

Umm, it should work either way as long as your modem is bridge mode and your router is handling the login and if necessary DHCP to the client handoffs.

Why it doesn't, is probably something to do with the above. Subnet difference issue possibly?

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i've got a Nortel Networks BayStack 450-24T Switch that i've inherited from one of my lan buddies. this switch has a com port in the front of it. i know when i used to play with cisco routers and switches at school we could com into them. how would i do that on this switch? i have a roll over cable with com connectors but what setup do i run in my terminal sever?

Answer:nortel switch question

9600 8-N-1
Flow Control Xon/Xoff

Also, you need a straight through cable with a DB9 connector on both ends, not a rollover cable...

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Am I going crazy? OK, don't answer that.

I'm on my second week in a new job as a security analyst in a medium sized company. This is my first full-time security position so I have much to learn, but my six years as a server/network admin give me a good start.

So on instructions of my boss, I build a Linux laptop as my tool kit. He specifically wants me to have nmap, nessus, and ethereal (wireshark) on it. No problem (even though I'd never used *nix before).

Now the network is fully switched, so ethereal is only going to be good for seeing broadcast traffic, right? Well I fire up the sniffer and I start capturing 2000+ packets per second! Whoa! I start looking at the packets and I'm seeing way more traffic than I should. Keep in mind that this is my first major use of a sniffer for me, so I'm not sure I'm seeing everything right.

Most of the traffic is labeled MRT protocol (TCP port 50000) all from one server going to another server. It is a data transfer of some sort (I can see customer names in the data stream). Can anyone tell me why I'm seeing this? It has to be a mistake, right? Is it something I should take to the Cisco guy on staff? If it is a valid error, then I want to make sure they know about it, but I would hate to raise a red flag over something that is expected.

To clarify, all of the network devices are switches, not hubs. Plus I have two laptops and only one data port, so I have another switch at... Read more

Answer:Switch config question

Not all traffic is unicast...

If the switch doesn't know the dest MAC, it will flood it out all ports. Some things (like the Windows Network Load Balancer in certain configurations) will spoof their MAC addy, so it never gets learned, and packets to the NLB will always get flooded out all ports unless you teach the switch.

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hey guys, im looking to upgrade the networking equipment for this office i work at, and im looking @ the 24 port Gigabit's, as we have about 15-18 computers to hook up to it periodicly...

all i need is 24 port (all 24 as gigabit capable), Unmanaged, Switch. but ive been reading up on Jumbo Packet Frames and how they can be a big performance factor in Gigabit Networks... but shoping @ Da Egg's site i didnt see any of theirt Switches that say anything about it anywhere... we are trying to keep the budget fairly low (i told my boss arround $120-180 for a switch before i realised that those were the dang 2x1000Mb port backplain switches) now that im not being decieved im thinking THIS D-Link is the way i wana go....

but can you all tell me if this switch supports Jumbo Packet Frames? and also give me a "what you think" about this switch?

Answer:Gigabit Switch Question

The only cheap switch to support jumbo frames and 24 port is SMC 8524T. It's going to set you back closer to $400 though, unless prices have gone down a lot recently. Jumbo packets are nice, but you have to run them on your whole network, otherwise it will just slow everything down with fragmentation.

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At work we have Ethernet at each work desk. This was fine for my one computer. But now I share my workspace and customers were asking for wireless when they sit in the showroom.

So here is what I did.
- I ran the ethernet into the proper connection port on back of switch.
- Ran 3 lines from the switch to 3 computers in the room. (hardwired)
- Used the 4th port on switch to give the wireless router a line for wirless broadcast.
This is perfect for me..... all the connections work fine.

The only problem is that using the Netgear instructions to reach the configuration menus does not work. I think it has something to do with the fact that the router is not using the line directly from the wall..... instead fed from the switch.

I tried to eliminate the switch altogether...... but for some reason when I plug the router directly to the wall all the computers on my network disappeared. I tried Public, Home and Work. But no other machines in our office would appear. This did however allow me to reach the configuration menus on the router.

Is there a way to access the router menus even when its getting a line from the switch?
I just want to be able to configure it on the fly..... instead of having to reconfigure the wiring just to get in to the menus.

Answer:Help with Router and Switch Question Please

sounds like you are running a separate wireless network within the wired network.

Basically, you need to disable DHCP and the router functionality of your wireless router.

Do not plug the cable into the "WAN" port on the wireless.

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Sorry for the newbie question, but I'm just getting into more networking at work so this should be an easy one. When it comes to 24 Cisco/3com... switches, what is the standard for when to use a crossover and which needs to be an uplink?

Answer:Switch/uplink question

In a typical setup a cross over cable is not used at all. In fact it's possible the uplink port is unused as well, but it's fairly uncommon these days.

Computers would plug into the switch using patch (straight through) cables. Any modem or router would plug into it using the uplink port. Typically speaking you'd also use a patch cable for this connection, although sometimes (older models usually) will require a cross over cable to do this.

On a normal switch today a corss over cable is basicly only going to be needed if you are connecting the switch to another switch.

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which 16 port switch is better between edimax and d-link?

may i know your feedbacks about it 'coz im thinking of purchasing either of the two.

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In my office I have a workstation, a webserver, a test box and a backup server all connected to an unmanaged switch, which is uplinked to my wall jack, which is connected to a switch. I'm not sure if that one is managed or not, but I think it is. My question though:

If I'm moving a few gigs of data between the webserver and the backup server, does the data go straight through my switch from box to box, or does it have to go through the uplink all the way up to a managed switch or a router and then come all the way back down the pipe?

The reason I ask is I have a couple of 100Mb NICs on my desk and I was wondering if setting up a seprate crossover network between the 2 boxes would speed things up any. Right now it takes at least a half hour to copy a 1 gig backup. (Both are 2.2 gig P4's with 512MB ram)

Answer:Switch / Router question

The data is going all the way back to the router first so yes, it would be faster if you set up a crossover network between the 2 computers.

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I understand that this person wants to split his internet connection with his pc and his xbox, but what is the difference between trying to share with a hub versus a switch, what makes the switch better in this situation?, Im curious to know, not try to bash anyone...

Answer:Another hub/switch to a router question

I am giving you your own thread.

You've been around here a bit, please start a new thread for a new problem!

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Hi everyone:

First of all - I am a real novice at networking but am learning fast so feel free to laugh.

I have a question about a networking situation I am doing within my computer lab at my school. (Systems running W98 and 95).

I have a 24-port switch and have my system as well as 21 of my total 24 systems hooked successfully to it (one of the ports in the switch is bad!)

I have three more systems that I'd like to get hooked to the network. How would I go about doing this? Would I need another switch? (Perhaps a simple 4 or 8-port)? If so - how do I connect a switch to a switch?

I'm learning quickly - made my own CAT5 cables last week. That was fun!

Thanks for any advice.

Answer:Networking switch question

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Hi, and thanks for taking the time to look over my question.

My father runs two towers through an 'IOGEAR' KVM switch. Both systems are Windows XP Home, SP3.

It appears that the KVM switch might be causing some issues and I thought he should disconnect the switch, re-boot and reconnect it. I did have him look through his Device Manager, but he was unable to locate anything related to the KVM switch.

I thought we might try and uninstall any drivers, then re-boot and have Windows re-install a new one. I don't believe the switch even came with any drivers, and it ran using the Windows drivers from the beginning.

My question is: Can somebody tell me where I would find the drivers within the Device Manager? (Under which category?) I'm guessing that it might be under the Human Interface Devices, but if anybody knows for sure and how I can identify it, that would be great.

Answer:KVM Switch Driver Question

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Alright, so there's a room with 4 ethernet ports and 5 are needed. I purchased a workgroup switch (Linksys EG005W ver. 3), thinking it would do what I wanted, but upon receiving it, I noticed that there's no "uplink" port. The problem here is if the switch assigns an IP to anything plugged into it, then it may assume such a role for devices on the other side of the switch. That was actually an issue here once, where someone incorrectly hooked up a VPN box that visitors used and it started handing out IP's to other devices on the network (they plugged the device into the internet port and the device port into the wall mount).

I'm not in a position to implement and "see what happens", so I'm thinking I might just RMA it for a router with an uplink port. Any input would be appreciated.

Answer:Question about a workgroup switch

Most new switches for the past several years are auto direction sensing (auto MDI/MDIX). So "uplink" well as crossover cables...have pretty much become don't need them anymore.

This particular model is housed in one of the older router series even though you see 4x ports grouped together..and a 5th port over by itself really doesn't matter.

The switch itself (this one, as well as unmanaged and most managed switches) does not hand out IPs..your router..or your server..does that. The switch simply repeats.

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I can get a Dell 5224 for under $400. Its a 24port managed, all gigabit switch. The plan is to use it with 12 Dell 2324 switches(24x 10/100, 2x 1000, dumb switch) connected using the two gigabit ports. This would give the lan, 83Mbits per user, should be more than enough, there is no reason to ever be able to saturate that. (Current lan just employs two 2324s)

I plan on using the 5224 to vlan each 2324 and setting up routes so only the services I want can take place across the lan(Limits the spread of virii, port scanning, hacking, games get high priority, filesharing gets lowest priority(except to one of the official fileservers that host the patches and such), etc).

Is this the correct route, or should I be considering other alterntives?

Answer:Managed switch question...

Just remember you have to go through a Layer 3 device to route any traffic between VLAN's. The 5224 is Layer 2. All the traffic will not be able to communicate with each other unless it goes through a Layer 3 device (VLAN-capable routers are Layer 3).

Good luck with the VLANs though. I could never get them to work properly on the 5212 or 5224. The one time I got them setup properly, the switch failed (and died) 2 months after I finished the config. Dell support is useless when it comes to networking issues.

I was not impressed with that aspect of an otherwise good switch.

I'm not sure what you mean when you talk about routes and priorities. It almost sounds like you're wanting to do full QoS, which the 52xx series will not allow you to configure. VLANs are going to allow you to create separate logical networks for traffic, they dont allow you to prioritize traffic on their own.

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Let's say I have two dissimilar networks; A and B. I plug them into a switch. Then I hookup a workstation, C, to the same switch. Would accessing the respective networks from workstation C be a simple matter of reconfiguring the interface to sit on the respective network? Hypothetically, a switch is network agnostic, purely a layer 2 device, so I would assume that would work.


Answer:Stupid switch question

Assuming you're not using DHCP on any network, and they're not in overlapping subnets, it'd be a simple matter of changing the IP on Device C.

So yeah, that'd work.

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Hopefully this is the right forum for this question. I have a Catalyst 2900 Switch that I am playing around with--learning the Cisco system. I tried to sign on and it will not accept the password. I need the password recovery sequence for this type of switch. I have the recovery for Cisco routers 25XX & 16XX but they do not work. Thanks for any help.

Answer:Cisco Switch Question

have you tried just hitting enter? Or another original one - password or password1??? Some people just aren't very original when it comes to passwords. We have a couple Cisco switches and some of them use these. Just a thought.

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I am getting ready to wire my whole house with CAT6 and I will be using the 1810 v2 switch for my network. I noticed that this switch is not made for standard rack mounting. How would be mount this on a 19'' server rack?

Answer:Question about HP 1810 v2 switch

8 port or 24 port because the 24 port has ears and racks just fine. The 8 port you'd probably have to get a shelf for.

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if a managed switch say a dell or cisco support ACL's.. will ACL's do the following?

Here is what I want to accomplish.

24 ports assuming a 24 station lan.
2 gigabit uplinks so 1 server feeding 24 stations

server running services on ports (to be determined later)

I want to effectvly block the ability of ANY station broadcasting ANY service on ANY port that I decide.

So basically, station 1 is unable to run service A on port #X, but station 1 is also unable to run service B - Z on port #X aswell.

Will managed switch with ACL accomplish this goal for me?

Answer:question regarding managed switch and ACL's

Kinda sorta... you could block certain computer from seeing anything from a specific TCP/UDP port if that's what you want - if you knew the specific port or range. You can also disable multicast and other network features if you wish or block specific computers from being able to send data on specified port(s), only receive, etc.

Keep in mind that if you want to run an ACL and keep up with enterprise, learn CISCO or grab a DELL. The DELL ACL language is very similar to CISCO, it merely shortens some of the syntax.

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If i use a switch, do i need a an IP for each for computer connected to it? and also, if i dont, will they all have the same IP and will it not be one of those 192.168... IPs?

Answer:Newtork Switch Question

Every machine on a TCP\IP network must have a unique IP address regardless of whether they are connected to a hub, switch or peer to peer. Using the same addee for more than one machine will cause an error and the second machine attempting to load TCP\IP using this address will fail to load the IP stack. There are many ways around this depending on your network, ISP and needs.

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If I have an unmanaged 24 port gigabit switch with a 10/100 router connected to it (dhcp/gateway) will two computers on the switch communicate with each other at gigabit speeds, or will all traffic still hit the router as the switch will not cache the mac addresses locally?

I know when I was working in labs with cisco 2950s they would keep a local ARP cache with the listings of the MACs of all devices connected to it so all local traffic would be forwarded by the switch, however I'm unsure if this would function the same way on an unmanaged "dumb" switch.

Any input is greatly appreciated!

Answer:10/100 Router & Gigabit switch Question

In most cases if the devices are connected to the same gigabit switch, then it should transfer files at gigabit rate. The 10/100 router will only be responsible for internet speed and act as the DHCP server.

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Hi, you can see that I am not an avid poster, but I have been viewing these forums for some time. I tend to just read and 99% of the time I can find the answers I'm looking for. Thanks for reading in advance.

I am looking for a KMV switch that will allow me to use a keyboard with a ps/2 port and a mouse with a usb port(i can switch to a usb keyboard but I'll explain that later). The problem is I have a logitech G7 mouse
and I'm pretty sure that when I switch to another computer using the KMV switch I will have some kind of problem with the other OS recognizing the mouse because it is cordless with a usb receiver. I've read that the mouse may not be recognized by the other OS or it will just be recognized as a regular 3 button mouse. Also from what I've read some KMV switches support some products better than others. To me it shouldn't matter because I thought the switch would just relay any data it receives, but I've just read about others having this problem I wanted to ask before I made a purchase.

I will have no problem switching to a usb keyboard but just trying to avoid that. Also I don't want to ditch the mouse seeing how it was a gift and I really enjoy using it(even though I can't use it in DOS).

Any help would be great. Thanks for reading.

Answer:KMV Switch with cordless mouse question

i tried to do that the other day, i couldnt find one that has inputs for usb and ps2 i bought a usb kvm the belkin flip one, and bought an adapter to convert the ps2 to usb for my keyboard however it still did not work.

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