Duplicate IP via DHCP

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inthecloset

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Jan 8, 2009
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MS Server 2003, dozens of XP desktops. IPs handed out via DHCP. This week, two stations lost network and internet connectivity. It turned out they each have the same IP, though both are set for DHCP. I first tried ipconfig /release & then /renew, but each picked up the same IP.

On the server, one was listed as owner of the IP. I released the IP on each, powered off each desktop & deleted the IP assignment on the server. So under DHCP, there was no assignment of this IP. I rebooted the server. I powered up one desktop and logged on. It picked up the same IP (which happens to be the first available one). It had connectivity. I powered up the 2nd, and it picked up the same IP. At that point, neither had connectivity.

These are each desktops that have been on the network for a long time and, coincidentally, they're identical models (AcerPower FH with Marvell Yukon adapters). I'm considering just making one static, but I'm bothered by my inability to resolve this. I've googled it without luck.

Any ideas?

Thanks,
 
Joined
Aug 7, 2007
Messages
9,028
First thing that comes to mind, do the two systems happen to have the same MAC address?
This will be shown on the Physical Address line after running ipconfig /all.

Not something you'd expect to change on it's own, but possible. Or possibly somebody has been spoofing MAC addresses for some reason.
 

inthecloset

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Jan 8, 2009
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95
Sorry for not replying, I haven't had a chance to get back to that computer. I'll post when I look into your ideas. Thanks.
 
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