DHCP server hang up and not responding

Hi,
I have log time DHCP server on W2K8 R2 for 3000 wireless users. Now i have problem with this server - log contained many same DHCP renew requests (about 250 per second):
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
11,03/17/11,15:05:41,Renew,172.18.161.221,Monca-PC.eduroam,0025D38240E4,,1784160628,0,,,
02,03/17/11,15:05:41,Audit Log Paused,,,,,0,6,,,
and server not respond for any other user.
How resolve this problem ?
Thanks,
Ladislav

Hi Ladislav,
Thanks for posting here.
Have you recently modified any DHCP configuration ? was only this client host recorded when this issue occurred ?
This seems like an attack from this client computer “ Monca-PC “, could you verify if this client computer has been installed antivirus and up the virus
definition to date?
For troubleshooting ,you may temporarily deny lease address for this host by setting MAC based filtering on Windows server 2008 R2 host and try restarting DHCP service.
Meanwhile, we may need to collect more information form server and this problematic client ,please take look the DHCP event log and post any full error or warring
event here for further investigation.
DHCP Server Events Tool
http://blogs.technet.com/b/teamdhcp/archive/2009/03/20/tool-to-read-dhcp-server-events-for-windows-server-2008-r2.aspx
For more information please refer to the links below:
Monitoring DHCP Server
http://technet.microsoft.com/en-us/library/dd183708(WS.10).aspx
DHCP Server Performance in Windows Server 2008 R2
http://blogs.technet.com/b/teamdhcp/archive/2009/06/29/dhcp-server-performance-in-windows-server-2008-r2.aspx
Thanks.
Tiger Li
TechNet Subscriber Support in forum
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