I have a Cisco 2811 with AIM-VPN/EPII-PLUS module, 768M of memory, and IOS c2800nm-advipservicesk9-mz.124-2.T.bin. Besides being a router for the head office, It also serves as a VPN terminator for roaming users.
Currently the number of VPN connections is very low, no more than 10 at a time but they experience some intermitten performance when accessing to the system thru VPN. Sometimes, it is very slow for around 15 to 30 minutes and then it works nornally again.
When it happens, the "sh process cpu" shows CPU utilization is about
20%/10% and "sh process memory" gives me the following Processor Pool Total: 698174272 Used: 73112080 Free: 625062192 I/O Pool Total: 12582912 Used: 6370736 Free: 6212176
From the two facts, I think the router is not overloaded, isn't it ?
What else I have to check to find the culprit ?
One more info : when the problem happens, if I disconnects the VPN and connect again, the problem goes away.
Any advice is really appreciated,
DT