I haven't looked into this, but is there a method to connect to a pptp server from behind an iptables firewall? I have seen glimpses of persons using something called ip_conntrack_pptp (sp?) and that seems it will fit the bill...not sure..here is ASCII art:
Client-----IPTABLES Firewall------INTERNET--------Remote PPTP server------Server I am currently using IPTables 1.2.5
