Monday, June 22, 2009

Three tables of processing

Books 2 Byte
Linux
Ashok Kumar Harnal
( http://www.tatamcgrawhill.com/)

Rule chains

Packets entering a firewall can be processed through three tables — viz. filter, mangle, and nat — writes Ashok Kumar Harnal in Linux: Applications and administration. A filter table reads packet content (packet header to be accurate) and based on the information content may decide to accept, reject, or drop it, he explains.

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