Concentrator to 3845 Tunnel Drops

Unanswered Question
Sep 8th, 2009
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We have a 3845 router that peers 20 plus IPSEC VPN tunnels. One tunnel connects to a 3060 Concentrator. For some reason, the tunnel drops periodically.

We have this config on our side:

crypto isakmp policy 1

encr 3des

hash md5

authentication pre-share

group 2

lifetime 28800

crypto map VPN 30 ipsec-isakmp

set peer

set security-association lifetime seconds 86400

set transform-set strong

set pfs group2

match address RemotePeer


We are using a PSK on the peers, and the concentrator has matching settings.

My question is could the drops be caused by the IPSEC timer being larger than the ISAKMP timer?

Any advise is greatly apprecitated.

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