I have 2 L2L tunnels set up with two outside contractors. I am using a 3005 device and the tunnels are up and active. Each contractor is able to pass traffic to my local network (ping devices on our private IP) however I am not able to get to their local networks. If I trace from our internal network to an IP on the contractor's side, the packets hit our concentrator and then take the default route out to the external interface of the VPNC and stop. It was my understanding that once a tunnel is up, the VPNC should know where to route traffic destined for that tunnel. However this is not the case. I'm not sure what I'm doing wrong.
I have this problem too.