There'a an article on sharing ADSL at webmonkey that may help :
http://hotwired.lycos.com/webmonkey/99/30/index3a.htm
You might want to look into using a Broadband Router with built-in firewall - such as SMC's Barricade 7004ABR Whoa. I use this model at the moment. So far as I can see it does not have a firewall really, it just has NAT and port filtering, which isn't the same
At 20:22 01/06/2002 +0200, Timothy Mason wrote: thing. It is also a peeg to set up, owing to one of the shoddiest manuals I've ever seen. Half the switches on the web interface are not even mentioned, let alone explained. OK, it works fine as a modem but as for security I'm not sure I'd trust it very far. I'm saving up for a proper solution in a few months' time. It's very, very hard to beat iptables with full logging and stuff like port sentry and log sentry sitting behind and watching them, imho, for a small network or home setup. :) Mark