I set up a IPSec tunnel between a Linksys WAG54G (Network A) and a OpenSWAN server behind a USR9106 gateway (Network B). The tunnel is established correctly, A can pings B and viceversa. The problem is that randomly the tunnel hangs, it seems esablished but networks can not ping each other anymore. If I try to re-establish the tunnel, it seems to be esablished correclty, but I can not ping. When I reboot USR9106 gateway all returns to work, so the problem seems to be that gateway but it only forward port 4500 to the OpenSWAN server!
Thanks in advance, Heruan