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IP conflict in home network

Vitnir

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May 16, 2002
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I have a router with 4 ports and to it is connected 4 different OS, Linux, W2K, XP Pro and XP Home. All computers play nice except the Xp Pro and XP Home, both of them insist on taking the same IP. I cant make either of them take a new IP through the commands ipconfig /release /renew or the repair function in control panel. I suspect there is an easy solution but I cant figure it, anyone?
 
Vitnir said:
I have a router with 4 ports and to it is connected 4 different OS, Linux, W2K, XP Pro and XP Home. All computers play nice except the Xp Pro and XP Home, both of them insist on taking the same IP. I cant make either of them take a new IP through the commands ipconfig /release /renew or the repair function in control panel. I suspect there is an easy solution but I cant figure it, anyone?
Click to expand...

Is it possible you have a static IP or IP's assigned to those cards?

If not, try setitng one to a static IP and see if that works. Or go into your router configuration and set up MAC address IP leasing so that your systems get the same IP every time.
 
They are setup to get a IP from the network so to me its a bit odd to me that they insist that they must have the IP that is already taken but I admit your suggestion is a promising workaround.
 
Reconfigure Linux IGD and the microsoft windows networking will stop with those pestering balloon network IP popups. :wide-eyed

Yea.. Linux IGD has to be prioritized over such network in order to get window machines to accept multiple shared IP addresses.
 
Two things to check:

(1) Do an "ipconfig /all" on both XP machines. Look at the Physical Address that comes up. Is it different on each, on the adapter you are actually using? They are supposed to be globally unique, but it HAS happened that duplicates have been handed out. (Or someone might have configured one of the XP boxes to emulate the address of the other one for some reason---maybe for purposes of emulating a required address for the ISP connection).

(2) Check the configuration of your router. Is it possible it was configured to hand out a particular IP address to the XP boxes based on physical address? (Granted, a router that hands out the same address to two PC's is still being idiotic, but sometimes configurable programs will let you configure them to do dumb things).
 
After setting the XP Pro system to a specific IP the conflict seems to be resolved, the system does not show up on the attached devices list so I can't reserv a IP in the router i.e. force the router to give out that IP. For the XP Home system the opposite worked so the router has reserved an IP for that system.
 
this sounds like a duplicate MAC issue to me as well. Note that if this is the case manually assigning an IP may not fix all your problems. On LAN connections machines actually talk MAC address to MAC address, if there are 2 machines on a LAN with the same MAC you can see some very weird network issues.

Even though it seems to be working I would follow krelnik's advice and check the Physical Address on each machine and make sure they are different.
 
kevin said:
this sounds like a duplicate MAC issue to me as well. Note that if this is the case manually assigning an IP may not fix all your problems.
Click to expand...

No two Network cards are supposed to have the same MAC Address. -- But I stress Supposed To. We had ordered two at work once and both had the same address.

Also check that you are not manually reassigning the MAC Address:
try the command
"ipconfig /all | find "Physical"
 
Well I have found the physical address and they aren't similar on the three Microsoft systems. The Linux system shares a monitor with the XP Pro system so I can't run them at the same time anyway.
 
Your first problem is using XP home :)

Is there a reason you are using the two different versions of Home and Pro? Most of the networking features are restricted and you shouldn't really be using it on a network at all (home that is).

I'd get rid of Home altogehter and stick to pro. Not the best answer, I know, but in the long run it is a better option
 
It's my el cheapo laptop that was preloaded with XP Home, the specs are way to low (256 RAM, 20Gb Hd) to run it properly or any other OS for that matter or I would change the OS to Suse.
 
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