Internet connection share with iptables

[Matt Morgan]

On Nov 14, 2007 7:36 AM, Shu Hung (Koala) <koalay at gmail.com> wrote:
> Hello all,
>
> I'm using GPRS on my notebook. And I want to share my internet with some
> computers on the same switch. I made a script with reference to wiki. But it
> didn't work. After running the script, other PCs can ping my notebook from
> 192.168.40.1 but not any external IPs. While my notebook can visit external
> websites normally.
>
> The below is my script. Please tell me what's wrong with it. Thanks!!!!
>
>
> Koala Yeung

[snip]

Sorry, I don't know enough about iptables to answer your question
directly. But whenever I've set up routing, I've followed the
instructions at

http://www.brennan.id.au/06-Firewall_Concepts.html

It's written for Fedora, but is probably identical (or nearly so) in Ubuntu.