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Error messages for DHCP server

I have a hybrid network (Win2k, Win95, Win98 and WinME). I have two Windows 2000 servers, partners domain controllers. In one of them, I have a DHCP server service running. It's integrated with DNS (compatible mode) and WINS on the same server.

My clients get a lease and everything is all right. Some days later, I received a call from a user (normally, Win9x user) saying that he can't use the network services because it's showing an "IP conflict message." When I go there and run winipcfg, I see this configuration:

IP: 192.168.1.x
Mask: 255.0.0.0 (should be 255.255.255.0)
DHCP Server: 192.168.1.245 (right)
Start of lease: a normal date
End of lease: nothing! (should be five days later start)

I checked our DHCP console and that IP address was given to another client. I've been asking a lot of people about this, but no one seems to be able to help me. I even asked my teacher for my MOC2153 class and he had never heard about it before.

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I'm not familiar with this problem either. But here are some possible issues. You may have two or more NICs that share the same MAC address. Check this and replace any duplicate with another unique MAC address NIC. Second, check your DHCP zones. Make sure they are fully configured and no stray or unknown zones are defined. Is the DHCP server authorized for the domain?

This was first published in October 2003

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