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Clients not getting new IP from new DHCP server

Posted on 2013-01-06
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Last Modified: 2013-02-03
I have migrated the DHCP role from an SBS 2008 server to a Win 2008 R2 Ent. server and clients are now getting ip from the new server.

I have checked the firewall on the server and dhcp is Enabled.   What could I be missing?
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Question by:tips54
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LVL 95

Expert Comment

by:John Hurst
ID: 38748413
Are they connected and working?  If so, are they just getting the same internal IP as they had before?  

Go to the new server, DHCP section, and see if clients are listed there.

.... Thinkpads_User
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LVL 27

Expert Comment

by:Jason Watkins
ID: 38748428
The question states they are receiving an IP address, but the title does not. Which is it?

Is the new DHCP server activated and authorized within Active Directory? It needs to be in order to hand-out IP addresses on the LAN.

http://technet.microsoft.com/en-us/library/cc759688(v=ws.10).aspx
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LVL 10

Expert Comment

by:acbxyz
ID: 38748430
Clients remember the ip of their dhcp server. As long as it it reachable and they have a valid lease, they don't ask for something else. To force them use the new one you can use "ipconfig /release" and "ipconfig /renew".

I assume your dhcp server is authorized in AD?
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LVL 70

Expert Comment

by:KCTS
ID: 38748446
The commonest mistake is to forget to authorise the server  http://technet.microsoft.com/en-us/library/cc759688(v=ws.10).aspx

or activate the scope http://technet.microsoft.com/en-us/library/cc786966(v=WS.10).aspx
#
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Accepted Solution

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tips54 earned 0 total points
ID: 38748488
I did remember authorize the server.
I figured out the issue.  The issue was with switch .  It was pointing to the IP address of the old server.  I had to add another IP address-helper command to point to the other DHCP.
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Expert Comment

by:Jason Watkins
ID: 38748491
Glad to see it is now working.
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Author Closing Comment

by:tips54
ID: 38848309
thanks.
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