Hi!
I just wanted to ask does anyone know how to "modify" this command:

iptables -t nat -A PREROUTING -p TCP --dport 6689 -j REDIRECT --to-port 6689

so that the port will forward from 192.168.0.1 to 192.168.0.2 (From my Linux server to my Workstation), so I can be connectable on irc, torrents and other p2p programs. I was given the command at one point by someone but not on a forum on irc but i had to format my disk and this is the only "simular" command that i could find to tell you what i need (even n00bs have to exist don't we? )

Tnx in advance,
shorto

Try this:

I haven't tested this so I can't guarantee it works but something like this ought to. Have a look at the iptables man page if you get stuck.

shorto:/home/shorto# iptables -t nat -A PREROUTING -p TCP --dport 32459 -j REDIRECT --to-destination 192.168.0.2:32459
iptables v1.2.11: Unknown arg `--to-destination'
Try `iptables -h' or 'iptables --help' for more information.

tnx for the link will try to get it right

Just found this link too, ignore the bit about the bastille firewall but the bit about iptables might help you. It's for a slightly older version of the kernel though so somethings may have changed since then.

-j REDIRECT changes ports within the same machine (to redirect port 80 to 8080, for example). You need to use -j DNAT (destination network address translation) instead.

hmm now i don't get an error it just doesnt do what it's supposed to do

You want connections from the internet (through the server) to reach 192.168.0.2, right? Make sure the port is open on the firewall as well as being NAT'd. You'd need

iptables -t nat -A PREROUTING -p UDP --dport 32459 -j DNAT --to-destination 192.168.0.2:32459
iptables -A FORWARD -p tcp --dport 32459 -j ACCEPT

this is what i enterd but still nothing ): Matir yes thats what i need

How have you tested that this is not working? What symptoms do you experience?

well i enter this and just restarted the aplications runing on my workstation (192.168.0.2) it was a torrent client and on the site it still says i'm unconnectable and my client says the same...

Did you open/forward all the neccessary ports? I don't remember exactly, but I seem to recall it being 6881-6899 or something similar.

well i forgot that i asked this here but thanks i have fixed the problem i found my old iptables save file and i just restored it and it works fine now.

thank you for your help