IPSec Tunnels set up, but can't pass traffic

philbo30 · Guest

I'm able to set up AES IPSec tunnels from an 1811 router to a 3845
router, but cannot pass traffic. A firewall, not under our control,
sits immediately in front of the 3845, so I suspect that it is causing
the problem.

Here's the config on the 1811 side:

crypto isakmp policy 2
encr aes
authentication pre-share
group 2
!
crypto isakmp key xxxx address 0.0.0.0 0.0.0.0
crypto isakmp keepalive 60 30 periodic
!
crypto ipsec transform-set backup esp-aes esp-sha-hmac
!
crypto ipsec profile backup
set transform-set backup

The tunnels look absolutely fine and are working on other interfaces
where the firewall isn't present. Any ideas?