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shoris

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Windows 2008 R2 DHCP server

I installed the DHCP role on one of the AD servers, and authorized, and active and yet the clients are not picking up a DHCP server.. Any suggestions? The old DHCP server died so i have litterally two days for this to work.. based on the lease expiration
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Firewall is off on the machine.. and I tried to renew on client still no go.. absolutley wierd.
Is the old DHCP server still authorized on AD? If it is deauthorize it.
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Nope that server is not enve the authorized *old dhcp sever
You can install WireShark on one of the computers an watch the traffic to understand what is happening.
Also check the event viewer for Event ID 1051:http://support.microsoft.com/kb/306925
You should setup a network trace on the server and on one of the clients and look at the DHCP communication between the client and the server

try using netcap /n:1 /b:150 /c:c:\DHCPtrace.cap

You can then look at the trace and filter for DHCP packets to see what is happening.
Since your DHCP Serevr IP changed, you should update the IP from your router/core switch. Have you done that?
Do you have managed switches in your environment?
You might have a dhcp helper setting configured on the switches.

Can you confirm this ?
did you chance to get the renew the new DHCP server IP in DNS setting ?
most of the chance it still using old DHCP range.
Check your switches, see if you have an ip-helper addressed configured. If you do, update the address to the new dhcp server.
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Well.. here is the solution.. the Filter in the DHCP server was enabled, once it was disabled, then the IP's were being distributed. That simple.. believe it or not. I can't believe it.
WOW.
I guess not, My bad. but really, yo_bee's responce to me was the accepted solution??? WOW to that.