client drops when there is no traffic

[mschooley]

have client going to router with dynamic crypto map configured, all works find except tunnel drops when no traffic, is the default behaviour, and is there a way to change

[ggilbert]

Try this command on the router.

crypto isakmp keepalive 10 5

This will send DPD message to the client.

http://www.cisco.com/en/US/products/ps6350/products_command_reference_chapter09186a008044392b.html#wp1199835

Hope this helps.