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DHCP Server not assigning IPs

Dear Experts,

I have Windows Server 2008 R2 installed DHCP Service. DHCP rang is (192.168.2.11 to 192.168.2.199) and lease timing is (8 hours). this rang is about 190 IPs and total workstations in my company are 150. This DHCP Server was working fine for last 4 months. but now its not assigning IPs automatically what can be the reason. is there any release timing issue or any other reason can be.
Please help me to fix my this problem.

thanks
naina
0
nainasipra
Asked:
nainasipra
1 Solution
 
Mike KlineCommented:
Are you using ip helper addresses or firewalls that may have changed.

You can check for rogue DHCP servers   http://blogs.technet.com/b/teamdhcp/archive/2009/07/03/rogue-dhcp-server-detection.aspx

Go through the DHCP events on your server, another tool that may help (this one I haven't used myself)  http://blogs.technet.com/b/teamdhcp/archive/2009/03/20/tool-to-read-dhcp-server-events-for-windows-server-2008-r2.aspx

Did anything change on your network at all?  Odd that it stopped working all of a sudden.  Network traces using wireshark or network monitor may also help.

Thanks

Mike
0
 
Krzysztof PytkoSenior Active Directory EngineerCommented:
Besides Mike suggestions, I would also check if someone (other administrator?) didn't deactivated scope or unauthorized DHCP server? These 2 things are necessary to get DHCP working.

Please verify also if your IP pool is not saturated in 100%, maybe there are no free IPs to issue?
Check also if your DHCP database is not corrupted?

Additionally, please open DHCP management console, select IPv4 node, click right mouse button and choose "Reconcile All Scopes" and "Verify" button.

And as the last one thing. restart DHCP Server service or reboot server

Regards,
Krzysztof
0
 
abhijitwaikarCommented:
Along with the above comments I suggest you to exclude DHCP database from real time antivirus scan otherwise it leads database corruption frequently.

Regards,
Abhijit.
0
 
essaydaveCommented:
Also, check that you don't have a reservation that's the same as the scope - If you have a reservation for 192.168.2.11, the server won't assign IPs, and it can take a while for the effects of that to show.  
0
 
Krzysztof PytkoSenior Active Directory EngineerCommented:
Hi,

any progress in your issue, new facts?

Krzysztof
0
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