HowTo: Route to different internal addresses, depending on port?

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Dear subscribers.

I'm trying to set up a home network and I have a problem that I hope I can
get some help with by all you competent subscribers. My network will have
one computer as a combined router/firewall running SuSE Linux 8.0 (Kernel
2.4.18). The internal network will be a mix of Windows and Linux computers.
One of the computers has a webbcam connected to it, which is used for video
conferences with my friends. The conference software is MSN Messenger, which
have a pretty peculiar network protocol since it opens dynamically allocated
ports, above port 1000, in both directions. My idea is to solve this by
routing all incoming requests on ports above port 1000 to the fixed internal
address of the webcam computer.

The setup is complicated by the fact that I would like to have a web server
etc. installed on the route/firewall server where I can publish my own
pages, i.e. it will service some of the ports below port 1000.

If it's at all possible I would also like to be able to connect additional
computers to the internal network which have Internet access using NAT rules
set up in the firewall and have their internal IP addresses assigned via
DHCP.

The setup would have been rather simple if it wasn't for the fact that I
have only one public IP address at my disposal.

Kind regards, Ola Theander
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