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Free High Level GNU/Linux Firewall – Shorewall

Shorewall is firewall or gateway configuration software for GNU and Linux. It is used in router, firewall and gateway applications in wide ranges. There is no limit to network interfaces numbers in application.

It is a free Linux Firewall application. Permission is available to copy, distribute and modify but always within rules and regulations laid in GNU Free Documentation License. Version 1.2 to latest 4.3, all have been published by the Free Software Foundation without front cover, invariant sections and back cover texts. Documentation is available in Docbook XML and HTML formats.

Features:

Software is completely customizable with configuration files. It carries out stateful packet filtering with connection tracking facilities of Net filter. It always supports overlapping and nested zones. Quick Start Guides to get first firewall up and also helps in quick running.

It helps to divide network in different zones for ease. Software provides complete control to user in fixing connections among zones or pairs of zones. In each zone, multiple numbers of interfaces are permitted and also in each interface multiple numbers of zones are allowed.

Shorewall supports firewall administration of centralized type. It is always installed on one administrative system like Windows PC running Cygwin and Apple Macintosh running OS X. Shorewall-lite is quite capable in extending its control over the firewall scripts generated centrally on the firewalls.

GUI is available with software via Webmin 1.060 or later version. It is possible to blacklist IP addresses and sub networks. Flexible address management is possible. Operational, VNP, IPv6, Bridge, Firewall, Traffic Control, Shaping, GNU and Linux Distribution supports are embedded.

Traffic accounting and Media Access Control Address Verification features are useful.Shorewall works with virtualization solutions like Xen, KVM, Open VZ, LXC, Virtual Box and Linux V server, so recommended to use in systems.

Shorewall

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