== summary ==
http://www.netfilter.org/
iptables is the interface to the packet filtering capabilities of the [[Linux]] kernel, [[netfilter]]
What is* http://netfilter.org/iptables?
* http:// www.netfilter.org/ projects/iptables/index.html▼
netfilter and iptables are building blocks of a framework inside the [[Linux]] 2.4.x and 2.6.x kernel. This framework enables [[packet filtering]], [[network]] addresss [and [[port]]] translation (NA[P]T) ([[NAT]]) and other packet mangling. It is the re-designed and heavily improved successor of the previous Linux 2.2.x ipchains and Linux 2.0.x ipfwadm systems.
== manpage ==
netfilter is a set of hooks inside the [[Linux]] [[kernel]] that allows kernel modules to register callback functions with the network stack. A registered callback function is then called back for every packet that traverses the respective hook within the network stack.
<man>iptables</man>
iptables is a generic table structure for the definition of rulesets. Each rule within an IP table consists out of a number of classifiers (iptables matches) and one connected action (iptables target).
{{manpage}}
netfilter, iptables and the connection tracking as well as the NAT subsystem together build the whole framework.
Main Features
== further links ==
* stateless packet filtering (IPv4 and IPv6)
* stateful packet filtering (IPv4)
* all kinds of network address and port translation (NAT/NAPT)
* flexible and extensible infrastructure
* multiple layers of API's for 3rd party extensions
* large number of plugins/modules kept in 'patch-o-matic' repository
* [http://iptables-tutorial.frozentux.net/iptables-tutorial.html Iptables Tutorial 1.2.2 by Oskar Andreasson]▼
▲* http://www.netfilter.org/
* [http://www.harry.homelinux.org/modules.php?name=iptables_Generator iptables generator von Harry's Linux-Seite], [http://harry.homelinux.org/modules.php?name=News&file=article&sid=3]
▲* http://iptables-tutorial.frozentux.net/iptables-tutorial.html
* [http://linuxreviews.org/features/ipv6/iptables/ IPv6 iptables firewall (Linux Reviews)]
[[Category:Linux]]
[[Category:Programs]]
[[Category:Networking]]
[[Category:Hacking]]
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