VPN tunnel dropping after code upgrade on 3825

Unanswered Question

Hi we have a 3825 at our main office connecting to several branches over tunnels. We were experiencing some bad magic chunk errors on a previous version of code so upgraded to 12.4(21).

However since the upgrade one of the tunnels drops out and re-establishes all the time. All other tunnels are fine except this one

Nothing has changed at the remote end, it's a 2821 router running 12.4-(13r)T

Is there some compatability issue here?

Nothing has changed in the config, so all I can think is it's this version of IOS but all other tunnels work fine

the only other difference is that the 2821 sits behind a NAT firewall all the others don't but this was never a problem before and it worked fine for 12 months

any help?

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sadbulali Tue, 11/04/2008 - 10:04
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When you clear security associations, and it does not resolve an IPsec VPN issue, remove and reapply the relevant crypto map in order to resolve a wide variety of issues that includes intermittent dropping of VPN tunnel.

I think this url might help information:http://www.cisco.com/en/US/products/ps6120/products_tech_note09186a00807e0aca.shtml#Solution5


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