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l2l vpn tunnel on asa drops when sending large files

I have l2l vpn tunnel to a remote office. My side is an ASA 5510, their side is a Firebox. The tunnel is fine until someone tries to move a large file over (~500MB). The file transfer will get about 3/4 of the way finished, then the entire tunnel will disconnect for a few seconds and then reconnect. Any idea what might be causing this?

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Re: l2l vpn tunnel on asa drops when sending large files

For the drops you can enable keepalives.

Also make sure the Keepalives and lifetimes match on both ends of the tunnels.

Following link will be useful for the configuration and troubleshooting :

http://www.cisco.com/en/US/products/ps6120/products_tech_note09186a00807e0aca.shtml#solunf

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