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Developer(s) Darren Reed
Stable release 5.1.1 / 30 January 2012; 2 years ago (2012-01-30)
Operating system FreeBSD, NetBSD, Solaris, Linux, HP-UX, ...
Type Packet filtering
License GNU GPL
Website coombs.anu.edu.au/~avalon/

IPFilter (commonly referred to as ipf) is an open source software package that provides firewall services and network address translation (NAT) for many UNIX-like operating systems. The author and software maintainer is Darren Reed. IPFilter supports both IPv4 and IPv6 protocols, and is a stateful firewall.

IPFilter is delivered with FreeBSD, NetBSD, Solaris 10 & 11. The current source code that can be accessed via sourceforge is covered by GPLv2.

IPFilter can be installed as a runtime-loadable kernel module or directly incorporated into the operating system kernel, depending on the specifics of each kernel and user preferences. The software's documentation recommends the module approach, if possible.

Operating systems that are known to support IPFilter include the following:

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