In addition to the good suggestion from Reza I have a few questions and suggestions:
- does it happen on a regular periodic basis (perhaps every 24 hours, every 4 hours, or some time period like that)? Or does it happen randomly?
- one thing that might cause the tunnels to go down is a lack of interesting traffic. Have you attempted to generate interesting traffic from the local LAN to the remote LAN and from the remote LAN to the local LAN (ping or something else depending on the access list that defines traffic for the VPN)?
- when the tunnel is not working can you access the router? If so it might help to get the output of these commands:
show crypto isakmp sa
show crypto ipsec sa
- when the tunnel is not working can you access the outside interface of the remote router? Can you ping it or traceroute to it? Can you telnet to it or SSH to it?
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