Hi. > I can't work out how to do this. All the instructions I can find tell me to > use ipfwadm, but Debian doesn't seem to offer it (not listed in debian > packages, for example).
"ipfwadm" is a part of the "netbase" package. I believe you can get a basic IP-masquerading setup up and running following the instructions in the Debian FAQ-O-MATIC: IP Masquerading / Firewall setup (resides on http://www.debian.org/fom/186.html as I am writing this). Also, having installed netbase try the manpage for ipfwadm. /Christian