Trouble accessing other servers by RAS

I’ve set up a RAS on my PDC, I’ve 7 other servers connected to it. I also have set up VNC on all the servers. However I’m only able to see the PDC, all other servers are blind to me. But when I am in the LAN environment, I can see all the 8 servers using VNC. Could someone tell me how to go about dialing into the PDC and from there able to see the rest of the servers? Thanks.

Regards
Young