said by Porch: An old PIII box filled with NICs and running Slackware as the main firewall at one school. We have about 60 desktop computers, 40+ network devices, along with over 100 wireless users going though it in any given day. It's been running flawless for the last 10 years. Even my Cisco gear needs a reboot more often.
I have an old P3 866 running pfsense. I took it down because a dsl and cable provider both came into the town and there was just no market share left.... but I use that same setup in multiple locations on some older dell gx110 hardware. I had one with 478 days of uptime. The only restarts they need are for software.