Difference between revisions of "Iptables"

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m (New page: iptables is a packet filtering, NAT/PAT and packet mangling tool for Linux. Used by a variety of Linux distributions including Ubuntu, Redhat and CentOS. Iptables is highly configurabl...)
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Revision as of 16:20, 7 March 2009

iptables is a packet filtering, NAT/PAT and packet mangling tool for Linux. Used by a variety of Linux distributions including Ubuntu, Redhat and CentOS. Iptables is highly configurable and are used in many firewall solutions.

Using IPTABLES

Iptables is a commandline command with numerous options, and need some training to master. Basically iptables has three chain.s

  • forward: Packets traversing from one Interface to another Interface
  • input  : Packets from a Interface to a local process on the machine. A packet from outside to the machine.
  • output : Packets from a local process - the machine itself - to the outside world.
iptables flowchart showing chains