Changing the source address when accessing a different network

From: Stuart (stuart_anderson@techie.com)
Date: 02/25/03 

From: stuart_anderson@techie.com (Stuart)
Date: 25 Feb 2003 07:12:26 -0800

I have a Linux RedHat 8.0 (2.4 Kernel) box set up as a
router/firewall.

It has 4 NICs which route to various private networks i.e.
10.1.x.x/16,10.2.x.x/16,10.3.x.x/16,192.168.127.x/24. The last NIC is
connected to a third party network which the 10.x.x.x networks need to
route to.

Unfortunately the third party network only allow connections from
192.168.127.x addresses and will not respond to hosts in the 10net
networks. I spoken to the people who supply the 192.168.127.x network
and they have said I should use NAT to change the source address of
the hosts on 10net networks when trying to access the 192.168.127.x
network and it will work fine.

I've looked up every resource I can find on NAT and Masquerading but
can't get the thing to work the 10net traffic still keeps it's source
address.

Can anyone reply with the iptables commands to get the Linux router to
change the source addresses?

TIA

Stuart

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