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ip address conflict on microsoft network

Posted on 2011-09-26
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Last Modified: 2013-05-04
I have multiple computers on my network and time to time I get ip address conflict messages how to fix?
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Question by:Coliday
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by:Don Johnston
ID: 36602581
If you are using DHCP to assign addresses, you will need to find the machine that has manually set it's address and change it to use DHCP. Or if the conflicting device is a server, router or printer, then it could be that you haven't reserved the proper range of addresses on the DHCP scope.

If you're not using DHCP then you need to find the device that has the wrong address and change it.

As for finding the offending the device, the address conflict message will provide the MAC address of the conflicting machine. If you have documented the MAC addresses of all the devices, you're all set. If you havent' and if the devices are connected to managed switches, there are some software packages that may help. But it depends on the make/model of the switches.

Other than that, all you could do is visit every machine and check it's IP address.
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Expert Comment

by:Gary Davis
ID: 36603920
Make sure you don't have more than one DHCP server handing out IP addresses.

Another possibility is the DHCP server is restarted (like a power failure on the router) and starts serving up IPs that have previously been handed out on devices that did not go down at the power failure.

Gary Davis
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Author Comment

by:Coliday
ID: 36612003
The later seems to be the problem. Most computers are turned off at close of day. Typically when this happens (usually during the day - and no from any power problems that we know of)  we power down the router for about 10secs and then power on. this usually fixes it. We do have a few printers that have fixed ip address but everything else is DHCP.. This is a random problem but one we are always trying to fix. The first answer seems a bit complicated to me. So not sure what action to take.
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by:Gareth Tomlinson CISSP
ID: 36708448
what kind of router, and how long is your lease time set for? How many devices, and how big is the scope?
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Author Comment

by:Coliday
ID: 36725416
linksys

Where do I find leases time?
 
12 pc  - 11 xp pro - 1 with vista

4 hubs
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by:Gareth Tomlinson CISSP
ID: 36813220
On the Linksys router, the DHCP scope will be set up with a range of IP addresses to use, DNS servers and default gateway and a lease time when the address expires.
If this is set too low the router will hand out the address again; the client SHOULD be aware of this but it doesn't always work so well.
Set the lease time to 7 days if you can, and make sure the scope only has a maximum of 30 IP addresses available to it (to allow for visitors etc.)
I'm assuming the hubs are unmanaged devices? I'd also suggest replacing them with small switches if they are really hubs; the 2 look identical but behave very differently.
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by:Coliday
ID: 36894363
turn out to be a loose cat 5 cable causing all the problems.
maybe that should be part of the discussions as well.

thank you.
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by:Gareth Tomlinson CISSP
ID: 36900507
LOL sadly that sometimes happens, so nil points for me!
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Coliday earned 0 total points
ID: 36983170
turns out there was another problem besides the cat 5 cable - which now turned out not to be the problem.  -   the power supply on one of the hubs was weak causing it to fail. Changed the power supply and everything is working fine. So you should add that to your list of solutions. Had nothing to do with everything else previously discussed.
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