I have two sites connected through a GRE IPSec Tunnel. All IP's are changed for obvious reasons.
Site 1 has 220.127.116.11 (Tunnel interface IP)
Site 2 has 18.104.22.168 (Tunnel interface IP)
The problem we are having is that this tunnel stops passing traffic every so often. I can shut the tunnel and no shut the tunnel and it comes right back up and passes traffic as it should for another period of time and then drop again.
When it drops, sh crypto session shows the tunnel as UP-ACTIVE. We never see the tunnel go to the down status.
All of our routes point to the correct place, so that isnt an issue, otherwise it would never work.
Anyone have any ideas on what we can try here? I have troubleshot this to death and have never seen a tunnel do this before.