[ Thanks to Lauren Simmonds for this link. ]
Open source operating systems like Linux, FreeBSD, and
OpenBSD have tons of built-in networking and security features, so
they are natural platforms for building security products. And most
commercial firewalls are built on one of them. There are multitudes
of choices — from tiny embedded systems for broadband wireless
routers to giant enterprise firewalls with all the bells and
whistles — from free community support to paid support.If you’re not an Internet service provider you don’t need the
big fancy expensive Cisco or Juniper gear; look for open
source-based products because they are proven, and you’ll save
money.