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Introduction to iptables

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Iptables provide a packet filtering framework for Linux that allows administrators and/or users to filter network traffic that flows in and out of their server/workstation. iptables provide a rich set of features such as stateless/stateful packet filtering, NAT (Network Address Translation) and PAT (Port Address Translation), packet manipulation and a lot more. iptables also provides an extensive module selection, some of the modules that are available are listed in Table 1.

Module Description
Nth This module allows you to match a particular Nth packet which has been received. This allows you to turn you're machine into a balance loader.
Time This module allows you to match a packet based on its arrival or departure timestamp.
String This module allows you to match a string anywhere in the packet.
Quota This module allows you to set a quota.

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