IPTables Firewall Help

[RattyUK]

Hi,

I have an Asus Router that runs a version of linux. What I would like to do is expose some of it to the internet, It currently runs a Web Interface for configuration a ssh server to shell access a Bit torrent downloader and a seperate web server (lighthttp). Info below:

Asus WL700gE
Kamakazi 7.09 (installed following back2basic's guide)
Web IF running on port 80
Web Server running on port 8080

What I want to do is the following
Works IP can get at port 80 and port 4001
Everyone else gets forwarded to port 8080

I am using dyndns to overcome the fact that I cannot get a static IP
I think the kernel uses IPTables so I imagine it is possible I just don't know how!!

Thanks in Advance

[Lazydog]

Have a look at this TUTORIAL for IPTABLES.

I would suggest you not open your server to the internet until you understand server security and how to configure your firewall properly.