SMC Networks Barricade User Manual page 22

192.168.123.2, and a PPTP VPN server at 192.168.123.6, you need to specify the following
virtual server mapping table:
Service Port
21
80
1723
Server IP
192.168.123.1
192.168.123.2
192.168.123.6
-21-
Enable
V
V
V