The question arose, which cannot allow its own forces and the forces of Google, you have to ask for advice.
Is the server on which you installed XEN, the guest installed ubuntu 10.04 (c two network interfaces) one of the network interfaces assigned address range of the local network, the second dhcp address of a virtual network of xen. Address that is allocated the ip of the local area, pinged, and gives you login via ssh to it, etc. in General behaves correctly.
The problem arose, to go to this ip from the local network and via VPN. VPN is already available, configured, and well-let the users on your internal network on all protocols, it would seem no problem, BUT the client connected via VPN it is not possible to log on to a server that is a guest in XEN, nor what Protocol... What to do?
PS actually I tried a lot of things, including port mapping with iptables, nothing happened. Defined, using tcpdump the packets from the VPN client to reach the server, but do not go back. But with a guest host, I can log into the VPN client.
Really need help, if necessary clarify, the configs, I'll send it. Thank you in advance