I have 2 units of cisco 2801 routers located in location A and B and the connection is based on pure IP connection.
However, there are third party VPN gateways connected to these routers and running L2TP tunneling.
The issue is the VPN connection always experience session timeout. When I checked on the router, didn't see any crc errors and ping request with 1404 bytes has no timeout.
Can I know why?