The router keeps a log of all activity within the router such as computers logging in and out and any attempts from the Internet to access the router. The log is viewable below.
 
 
Log File
System Log
08/05/2009 09:54:33 192.168.2.2 login success
08/05/2009 09:44:43 sending ACK to 192.168.2.2
08/05/2009 09:44:42 sending OFFER to 192.168.2.2
Firewall Log