pfSense是源自于m0n0wall的操作系统。它使用的技术包括Packet Filter，FreeBSD 6.x（或DragonFly
BSD，假如ALTQ和CARP完成了的话）的ALTQ（以出色地支持分组队列），集成的包管理系统（以为其环境扩展新的特性）。
Chris Buechler has announced the availability of the first release candidate for pfSense 2.0, a FreeBSD-based operating system for firewalls: "Years
and many thousands of hours in the making, pfSense 2.0 release
candidate 1 is now available. This is considered a stable release
suitable for production use, as we've already widely deployed it over
the past several months in beta and upgraded numerous systems to RC1
over the weekend. This is the preferred version for new installations at
this point. For existing 1.2.x users, upgrading will be a smooth
process for most if not all scenarios. Some portions of the
configuration are considerably different now than in 1.2.x releases, and
we suspect there may be some configuration upgrade problems remaining,
though we aren't aware of any specific issues at this time and have
tested a wide variety of configurations." Read the release announcement and release notes for a full list of changes and new features. Download: pfSense-2.0-RC1-i386.iso.gz (95.6MB, SHA256), pfSense-2.0-RC1-amd64.iso.gz (109MB, SHA256).
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