Wazzup dear and powerful open source community
This is yet another newbie question
Here's the point:
I've got an "old" Celeron 700 Mhz, 128 Mb Ram, with Slackware 10.2 (default kernel) installed. Two network cards are plugged into it (eth0 which goes to the ethernet modem, eth1 which connects with another PC using WinXP)

I've found a "simple" iptables config which allows me to share internet connection between these two machines, allows FTP access and outgoing traffic and SSH.
The problem comes when I want to use eMule on Windows, I get the "lowid" message.
Despite my attempts to make it work with configurations found on eMule's website, I can't get it running!

Can anyone of you help me out with this?

Thanks,
Cheers

what is the message of the firewall saying? try to use a log, see how u log with iptables.
the easiest thing to do though is
http://www.ipcop.org/

You need to have an open port back to your pc through the firewall to allow sharing of your files in order to get a highid.