Since upgrading to the official DD-WRT firmware I'm having a strange issue. I'm running Symantec Endpoint Protection (SEP) 11.06 on all my computers and they periodically pop up with a message indicating that a denial of service attack was detected from the IP of my router, then it starts blocking web access. When I disable SEP I can get to the internet. The SEP log has these entries:
Denial of Service "UDP Flood Attack" attack detected.
Description:
An excessive number of User Datagram Protocol (UDP) packets are being generated on this computer causing 100% CPU utilization.
Traffic from IP address 192.168.11.1 is blocked from 9/21/2010 10:44:17 PM to 9/21/2010 10:54:17 PM.
Active Response that started at 09/21/2010 22:44:17 is disengaged. The traffic from IP address 192.168.11.1 was blocked for 600 second(s).
I'd contact Symantec about this but I've been using SEP on my network with the WZR-HP-G300NH for several months without issue until I upgraded the firmware.