Linux Port Forwarding

IP Port Forwarding for Linux
------------------------------

The ipmasqadm kernel module is required to make this happen.
You can download ipmasqadm-0.4.2.tar.gz  via anonymous ftp from woody.unixpeople.com
or the latest version is available from: http://juanjox.kernelnotes.org

You will want to read the man page for ipmasqadm, as you may need to
recompile the kernel with the specified parameters.



Configuring Port Forwarding
-----------------

/usr/sbin/ipmasqadm portfw -a -P tcp -L 171.133.80.22 3025 -R 165.48.113.141 3025

the -a is add

the -P is the protocol to forward

the -L is the interface and port to accept the forwarding

the -R is the device and port to forward the request to.


You will then want to have your inside hosts masquerade to the outside 
world as port forwarding only allows packets to go in one direction.

Masquerading
--------------

/sbin/ipchains -A forward -s 192.168.37.0/24 -d 0.0.0.0/0 -i eth0 -j MASQ


the -s is your internal network

the -d is the destination, in this case the destination in the whole world

#JJR