VPN

I have monowall 1.231 setup in several remote library branch locations. I can connect to the monowall interface remotely by using VPN and configure everything on Monowall. I cannot connect to a Netgear WAG102 connected on the OPT1 interface. There is probably some rule or rules to configure but I haven't figured them out. I have firewall rules allowing PPTP interface access to the exact IP address of the access point on the WAN interface and on the OPT1 interface. Any ideas how to make this work? Thanks in advance.

I should have included this. I am trying to connect to the management interface of the Netgear wireless access  point which you normally do by plugging a cable into its ethernet port and typing the WAP's IP address into the browser of a PC in the same subnet.