I have managed to complete phase 1 and phase 2 of the VPN from the ASA 5520 to the remote office which is a Cisco 877 DSL router.
Now here is the difficult part to explain:
Is seems that if I ping servers from the remote office to servers on the inside of the ASA they won't reply, but if I reverse this and I send a ping from one of the servers on the ASA's inside to the remote network it will time-out (on one line) then come up and then both sides can ping. It's as if the ASA/server side can start the communication only which is not right, I want both sides to be able to do this.
I then notice on the ASA 5520 that I will have 1 IKE tunnel and 1 IPSec tunnels, and these IPsec tunnels will increase if I ping from another server to the remote network, is the right?
I pinged the remote network from 4 servers and it went:
1 IKE Tunnel 1 IPSec Tunnel
1 IKE Tunnel 2 IPSec Tunnel
1 IKE Tunnel 3 IPSec Tunnel
1 IKE Tunnel 4 IPSec Tunnel
If I ping from another server not yet used it will be:
1 IKE Tunnel 5 IPSec Tunnel
I thought 1 IEK and 1 IPSec tunnel would support all communication.