I am experiencing a problem with a newly installed Cisco 1811 router which stops passing traffic over one VPN tunnel every day at the same time. Here is the topology:
Site A: Cisco 1811 K9 with VPN tunnels to Site B and Site C
Site B: SonicWall Pro 4060 With VPN tunnels to Site A and Site C
Site C: SonicWall TZ 170 with VPN tunnels to Site A and Site B
The A-B and B-C tunnels are fine and when traffic stops over the A-C tunnel, both ends still show the tunnel as up. So far our "fix" has been to restart the new Cisco.
I'm not even sure how to start troubleshooting this. So far we have tried restarting the Cisco at night to see if it effects the timing, but it doesn't. Every day at the same time the tunnel stops.