Site-to-Site VPN - one side behind firewall

Unanswered Question
Jun 29th, 2008
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Hi forum!


I have two ASA5505 and want to setup a site-to-site vpn.

I used the ipsec wizard and the vpn works so far.


The problem is the remote side where the asa is behind a firewall of my isp. The incoming ports are completly closed.


Now if the idle time pass by and on the remote side there is no traffic the tunnel disrupts.


I found a workaround by setting the idle-timout to none. But if the tunnel disrupt by other reasons, e.g. ISP disconnects I can't rebuild it from the server side.


Is there any command to send a keepalive signal or something?

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a.alekseev Sun, 06/29/2008 - 07:11
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tunnel-group x.x.x.x ipsec-attributes

pre-shared-key *

isakmp keepalive threshold 15 retry 2


gerdpleyer Sun, 06/29/2008 - 09:50
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Hi! Thanks for the quick reply.


But the keepalive is standard - or isn't it?

Where should I set the keepalive - core or remote? or both?

I think the problem is that the core ASA can't connect to the ASA behind the firewall.

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