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[http://www.halon.se Halon Security]
's ''security router'' (SR) is a network operating system and software distribution based on OpenBSD[http://en.wikipedia.org/wiki/OpenBSD], with the main differentiator being the single, revision-managed, clear-text [[configuration file]] with [[backend|soft re-configuration]] (atomic commits) editable from [[configure|CLI]] and web interfaces ([http://sr.demo.halon.se live demo]), and documented security [[architecture]].
In general, it's a routing platform with security and VPN features. It aims to be a replacement for proprietary solutions like Cisco IOS[http://en.wikipedia.org/wiki/Cisco_IOS] and Juniper Junos[http://en.wikipedia.org/wiki/Junos]. You can download it for free from http://dl2.halon.se/vsr/ and run it from (for example) a USB stick in a x86 computer (anything from the affordable ALIX[http://www.pcengines.ch/alix.htm] to high end systems with 10GE cards), or as a virtual machine. New user are encouraged to read the [[getting started]] page.