Hi,

I'm kinda newbie when it comes to routing. I know that iptables does the routing and that there are scripts that make the basic setup. What script would you suggest for me to use? I would it like to make only the basics. Also if you got any useful tips on routing, I would like to hear them.

Routing is all about creating your own route(path) from host to destination. It could be a non-default/non-existent path & thats why we want it to be created.

As linux box can act as an router, we directly land up with a question of WHY & WHAT for we need a route to be created or WHY do we want this linux box to act as a Router?

If you have reasons for these WHY & WHATs then you should better find topics popping out like tunnelling/port forwarding, packet forwarding, NATTing, masquareding & others infront of you.

Otherwise for everything on this top & detailed study..
http://www.tldp.org/HOWTO/Adv-Routing-HOWTO/

Also read this tutorial on Linux as a router @ http://www.linuxjournal.com/article/5826
This one even though a bit old as use of ipchains is mentioned over here.

Learn Masquerading here.. (nice complete reference)
http://www.tldp.org/HOWTO/IP-Masquerade-HOWTO/

Also go through & get comfortable with IPTABLES. Refer man page & GOOGLE it.

..amit..

How can I see what ports are open?

$nmap localhost
$nmap <ip>
$nmap -sS -P0 -v

refer man page for further details & options.