VPN

I am having an issue with running more than 1 pptp session at a time Nat'ing through the monowall firewall to the same public IP.  I know certain routers have this problem and certain ones don't. 

I am not on the most current release of Monowall yet, but will by tomorrow to see if there is a fix in the nat proxy thing. 

I need this to work for this weekend (just temporary) for some client that has to use MS PPTP vpn.  I guess I could try having just one of them connect to the vpn server and then have the other 3 pc's use MS internet connection sharing??? Maybe???