Port forwarding from the ip-up scripts

["Ben Tullis" <ben.tullis@infomatrix.ltd.uk>]

Hello folks.

I am having some degree of trouble getting port forwarding to work seamlessly.  The firewall is a potato box running ipchains and the default ipmasq scripts. 

 

I can manually run:

 

ipmasqadm portfw -a -P tcp -L (current IP address of ppp0) 80 -R 192.168.1.50 80

 

without any problem, but I have been trying to get it to initialise from the ip-up scripts.

Like this

 

#!/bin/sh

# This script is /etc/ppp/ip-up.d/fw

ipmasqadm portfw -f

ipmasqadm -p tcp -L $4 80 -R 192.168.1.50 80

 

and so on for other ports and protocols.  The $4 should equate to the local IP address since those are the variables which pppd exports for the run-parts scripts.  I made sure that the script was marked executable, but that didn't help.

 

I have also tried running the commands from within /etc/ip-up.

 

Has anyone had any joy with this method, or can anyone suggest another?

 

Thanks

 

Ben Tullis