DNS wrong with DHCP

[rye8261]

Ok, here is what is happening. Our dhcp server appears to be working fine. At first boot of a PC it gets an IP address and can get online and everything is fine. Then at random some computers lose the DNS that was assigned (192.168.0.12) by the dhcp and is replaced with this DNS address 172.16.10.1

I don't know if this has anything to do with it or not but better to give full details. We have two servers acting as DNS servers. One of the servers had a name conflict with a printer taking the servers name. That issue has been resolved and both servers are functioning again.

The other thing that happened around the same time was that I downloaded the Microsoft Exchange 2007 evaluation package and put it on our virtual server. DHCP is not installed on it and the DHCP function is not enabled on the virtual server network card.

The quick fixes that have worked for me. I can repair the network connection and the computer will function again for a random amount of time. I can also hardcore the dns and it works great but defeats the purpose of dhcp and peopole cant use their laptops on the road like that.


Thats all the info that I have, if there are any questions please let me know nad if anyone has any ideas please let me know.

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[ShackDaddy]

When a client has the 172.# address for the DNS server, check ipconfig and verify who the DHCP server is. Whoever is says is the DHCP server: that's who's supplying the DNS address. It may not be who you'd think. Could be someone else has installed something on the network. Actually, I'm pretty sure that's the case. Someone in the office could be using an old multiport broadband router as a switch or something. That's all it takes.

Also, check both the server and scope options in your active DHCP. Could be there are different settings in each.

ShackDaddy