What VPN do u have, pptp ??
for pptp, u should forward "GRE protokol" and "tcp protocol port 1723" to your vpn server.
most of dsl routers do not support forwarding GRE protocol.
pptp should work if u set DMZ host in router config.
i do not prefer dsl-routers use directly as gteway (nat, port forward etc.). i place a linux/BSD firewall between LAN and dsl modem and use dsl modem in bridge mode. So i can get public ip on my firewall via pppoe.
Last edited by maxut; 02-27-2013 at 03:40 AM.