Sorry for the late reply, I was on a ski trip...
I now changed the VPN server to 10.0.0.254 and the clients to 10.0.0.128 and up. When connected, the client receives a proper IP, but the default gateway is still blank. The subnet of the clients is 255.255.255.255 (this is different from the subnet of my home network, 255.255.255.0). I can ping the Server by IP, but still not by name.
Example:
m0n0wall is 192.168.1.1 and all the other computers/devices are 192.168.1.2 - 192.168.1.25 with a subnet of 255.255.255.0 and the VPN server is 10.0.0.1 and all VPN users are 10.0.0.2 and up with the same subnet.
When you say "same subnet", do you mean it has to be 255.255.255.0 as well? And if so, how do I change that?
Thanks for you help!
Tom