I have an existing L2L VPN setup with a Cisco 3030 and a Cisco 3620. It has been working fine for the last few weeks.
A few days ago, the tunnel dropped and now I only see traffic in one direction. There's no error messages in debug on either routers and I'm not sure where to go from here.
I can see the VPN establish, Phase 2 is completed on both sides.
I can see traffic leave the 3030 but I never get anything back from the 3620.
Doing a packet capture on the 3620 I see no IPsec packets leave the router to the 3030, it is simply not tunneling the traffic.
"Network lists" on both devices are set the same, networks:
There is no firewall in front of the 3620, packets are simply not leaving the router.
The 3620 has a single interface, it is a "router on a stick", I'm not sure if this could be causing any issues.
I've attached the 3620 config.
Anyone has any idea?