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Windows 2008 R2 DHCP server

Posted on 2013-01-02
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Last Modified: 2013-01-03
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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Question by:shoris
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by:becraig
becraig earned 167 total points
ID: 38738711
Did you follow the instructions as indicated here :
http://www.howtogeek.com/99723/how-to-set-up-dhcp-in-server-2008-r2/
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by:Stelian Stan
Stelian Stan earned 166 total points
ID: 38738739
Are the ports open on firewall into your 2008 server?

Then from any client run:
ipconfig /release
then
ipconfig /renew
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by:shoris
ID: 38738744
Firewall is off on the machine.. and I tried to renew on client still no go.. absolutley wierd.
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by:Stelian Stan
ID: 38738757
Is the old DHCP server still authorized on AD? If it is deauthorize it.
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by:shoris
ID: 38738765
Nope that server is not enve the authorized *old dhcp sever
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by:Stelian Stan
ID: 38738780
You can install WireShark on one of the computers an watch the traffic to understand what is happening.
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by:Stelian Stan
ID: 38738791
Also check the event viewer for Event ID 1051:http://support.microsoft.com/kb/306925
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by:becraig
ID: 38738794
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.
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by:teomcam
ID: 38738927
Since your DHCP Serevr IP changed, you should update the IP from your router/core switch. Have you done that?
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by:yo_bee
ID: 38738931
Do you have managed switches in your environment?
You might have a dhcp helper setting configured on the switches.

Can you confirm this ?
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by:piyushranusri
ID: 38738949
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.
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by:lruiz52
ID: 38739056
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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yo_bee earned 167 total points
ID: 38739736
@iruiz52
I guess you do not read through the thread prior to posting?  Look up three post from this one and you will see that someone has already offered that suggestion.

-Mike B-
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Author Comment

by:shoris
ID: 38739816
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.
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by:yo_bee
ID: 38740007
WOW.
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by:lruiz52
ID: 38742495
I guess not, My bad. but really, yo_bee's responce to me was the accepted solution??? WOW to that.
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