Solved

DHCP Server not assigning IPs

Posted on 2011-09-24
5
494 Views
Last Modified: 2012-05-12
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
Comment
Question by:nainasipra
5 Comments
 
LVL 57

Expert Comment

by:Mike Kline
ID: 36594452
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
 
LVL 39

Accepted Solution

by:
Krzysztof Pytko earned 500 total points
ID: 36595132
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
 
LVL 10

Expert Comment

by:abhijitwaikar
ID: 36595730
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
 
LVL 6

Expert Comment

by:essaydave
ID: 36596613
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
 
LVL 39

Expert Comment

by:Krzysztof Pytko
ID: 36915818
Hi,

any progress in your issue, new facts?

Krzysztof
0

Featured Post

Complete VMware vSphere® ESX(i) & Hyper-V Backup

Capture your entire system, including the host, with patented disk imaging integrated with VMware VADP / Microsoft VSS and RCT. RTOs is as low as 15 seconds with Acronis Active Restore™. You can enjoy unlimited P2V/V2V migrations from any source (even from a different hypervisor)

Join & Write a Comment

Synchronize a new Active Directory domain with an existing Office 365 tenant
OfficeMate Freezes on login or does not load after login credentials are input.
This tutorial will walk an individual through locating and launching the BEUtility application and how to execute it on the appropriate database. Log onto the server running the Backup Exec database. In a larger environment, this would generally be …
This tutorial will walk an individual through the process of configuring their Windows Server 2012 domain controller to synchronize its time with a trusted, external resource. Use Google, Bing, or other preferred search engine to locate trusted NTP …

708 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now