Попробуй в самом начале добавить
Код:
${ipfw} add divert natd tcp from any to any 1723 >> /tmp/firewall
${ipfw} add divert natd gre from any to any >> /tmp/firewall
${ipfw} add allow tcp from any to any 1723 >> /tmp/firewall
${ipfw} add allow gre from any to any >> /tmp/firewall
${ipfw} add allow tcp from any 1723 to any >> /tmp/firewall
