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New Member

Cisco 800 Series to ISA 2004 site to site VPN


I have been trying to get a site to site IPSec tunnel up and running from our branch office running a Cisco 857 Router to our Main office running ISA 2004.

I can create a Site to Site VPN connection using SDM and can get the tunnel established. But when I try and ping an IP address at the Main Office from my Branch Office I get "Destination net unreachable".

I have found several documents on setting up site to site connections between ISA and PIX but there is no real example I can find for the router I am using.

I presume that it is possible but as I am new to Cisco VPN tunnels I need some help in getting this working.


Re: Cisco 800 Series to ISA 2004 site to site VPN

This could be due to many things, primarily looks like a routing issue. Make sure you have the necessary routing working. Also, if you are using NAT, make sure the routing for the NATed addresses are working fine too.

New Member

Re: Cisco 800 Series to ISA 2004 site to site VPN

Maybe this article will help

Have you monitored the ISA Server to see if its dropping the traffic, remember it will drop everything by default.

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