Its also fairly easy to convert a standard Linux distro into a decent router (if you know a little about inetd etc).
Mine is based off Debian Stable, has an internal ADSL card, 2 ethernet cards and provides firewalled internet support for 4 machines. Longest its stayed up for is 4 months (and that was my choice to shut it down).
Just added a web, mysql and ftp server for some stuff I'm playing with. SSH provides you all access for maintence, log checks etc
Linux/BSD Router flexibility makes them so much better than the brought router for the serious geek.
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