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vpn tunnel goes down

I've got two 2600 routers connected to each other using site-to-site vpn. Problem is the connection goes down after a while. When I first start the routers the connection is there, but I come back half an hour later and there's no tunnel, neither router can see the other, it all has the feeling of being flakey and unreliable. In the vpn setup I included the command:

router#crypto ipsec security-association lifetime seconds 86400

on both machines but still the connection goes down.

I also put in:

router#crypto ipsec df-bit clear

but the connection still goes down.

If there's another command I'm missing that helps keeps the connection stable I'd be grateful to know it. Thanks for any help.

1 REPLY
Bronze

Re: vpn tunnel goes down

Try to issue the "crypto isakmp keepalive 10 periodic" command. It will send keepalives across the tunnel and keep it up.

Go here for more reference on the keepalive option. http://www.cisco.com/en/US/docs/ios/12_3t/secur/command/reference/sec_c2gt.html#wp1199835

Hope this helps, rate if it does,

JB

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