2. IP Filter firewall

2.1 Presentation

IP Filter is a firewall operating at the network layer of the OSI model. It relies on IP addresses, ports and protocols. It is loaded into the operating system as a module. The source code or compiled packages are available for multiple operating systems: Solaris, Solaris-x86, SunOS, NetBSD, FreeBSD, BSD/OS, IRIX, OpenBSD, some Linux distributions, HP-UX, Tru64 and QNX. It is also a native part of the following operating systems: FreeBSD, NetBSD, xMach, Solaris 10 and Open Solaris.

2.1.1 Features

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