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）。
The third release candidate ofpfSense(a small, FreeBSD-based firewall) is out and ready for testing: "1.2-RC3 has been released! Here are just a few of the new improvements and features that have made their way into this new version: IPSEC Carp rules cleanup; IPSEC stability workarounds for > 150 tunnels; do not allow sticky connection bit to be set if PPPoE is enabled; work around heavy network activity issues; bump lighttpd to 1.4.18; show wireless nodes regardless of whether we can determine BSS value; IPSEC tunnel endpoint highlighting in system logs; show the IPSEC interface as an option for the traffic graph; add RRD settings page; make it possible to disable RRD graphs; correctly set reflection timeout for all protocols; restart SNMP services after LAN IP changes..." See therelease announcementfor a complete list of changes.Download:pfSense-1.2-RC3-LiveCD-Installer.iso.gz(49.7MB,MD5).
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