Thank you for your quick reply.
I follow this article to setup the tunnel and configured the firewalls according to it.
The servers are reachable when i disconnect the VPN connection on router2.
The host names are resolving to the external IP of router1.
I have set up the firewalls according to the above article. The servers are reachable when VPN is disconnected.
Yes, as far as I can tell.
Yes, as far as I can tell.
UPDATE: I am not able to ping the remote external IP of router1 (ICMP timeout). Maybe that's a hint to something....