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The ''securityrouter.org'' is a network operating system and software distribution based on [http://en.wikipedia.org/wiki/OpenBSD 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]].
It's developed and maintained by [http://www.halon.se Halon Security], although their primary business is a hosting-grade, scriptable [http://
wiki.halon. se/ Overview email platform/gateway] (offering anti-spam, among other things).
In general, it's a routing platform with security and VPN features. It aims to be a replacement for proprietary solutions like Cisco [http://en.wikipedia.org/wiki/Cisco_IOS IOS] and Juniper [http://en.wikipedia.org/wiki/Junos 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 [http://www.pcengines.ch/alix.htm ALIX] to high end systems with 10GE cards), or as a virtual machine. New user are encouraged to read the [[getting started]] page.