DHCP not giving out second DNS to XP

[ZeroHour]

Hi

We have a migrated DHCP from Windows 2000 to Windows Server 2008 and I went to change our DNS server entries (change the second DNS to a new DC ip) but after making the change XP clients are only getting the FSMO DNS (which should be DNS 1) and not the changed second DNS entry. I tried reordering the list so the new DNS ip was first but clients still receive only the FSMO ip as a DNS server.

The strange thing is a standalone vista client gets both IP's and seems to work correctly. I added a gateway ip to the DHCP and XP clients got that change but they just wont update DNS ip's

Am I doing something silly or should this not just work?

Any ideas?

 

Cheers

[Jay]

at the risk of sounding daft, have you cleared the XP machines DNS cache?

[DMcCoy]

DNS hasn't been set in a GPO has it?

[ZeroHour]

at the risk of sounding daft, have you cleared the XP machines DNS cache?

 

Yeh I did all the ipconfig switches and cleared DNS/DHCP entries from the server before /renew'ing

 

DNS hasn't been set in a GPO has it?

It can be set in GPO?!?!

[SYNACK]

It can be set in GPO?!?!

 

Computer Configuration -> Administrative Templates -> Network -> DNS Client : DNS Servers

[ZeroHour]

Does not appear to be set there.

I did a wireshark sniff and dhcp is sending 2 dns servers back in the packet.

[SYNACK]

You could try reseting the ip stack on one of the stations to see if this gets rid of the old settings, if so you know it is probably another bug:

 

How to reset Internet Protocol (TCP/IP) in Windows XP

 

You could also try reseting the DNS with a VBS script to see if that sticks any better than the DHCP settings change:

 

Modify the DNS Server Search Order for a Network Adapter

[ZeroHour]

You could try reseting the ip stack on one of the stations to see if this gets rid of the old settings, if so you know it is probably another bug:

 

How to reset Internet Protocol (TCP/IP) in Windows XP

 

That seems to have worked. Thanks so much

Now to figure out a way to deploy it.... or the cause...

[SYNACK]

That seems to have worked. Thanks so much

Now to figure out a way to deploy it.... or the cause...

 

Your welcome, I'd just chuck it in a batch file as the last shutdown script in the machines GPO, its just the one command so you may not even have to copy the TCPreset batch file to the local drive before executing it.

Edited January 28, 2009 by SYNACK

[ZeroHour]

Found the cause. The unattended file had a dns search order set in it with the one server listed. Cant believe dhcp did not override it.