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|{{Admon/note | | '''[http://en.wikipedia.org/wiki/Iptables Iptables] is the built-in firewall for LINUX'''. Iptables is consisting of a '''list of rules''' (or '''"tables of policies"'''). If data matches a specified rule, it must “jump” to an existing '''condition'''. Simple conditions include '''ACCEPT''', '''DROP''' and '''LOG''' but there are also more complex conditions that can be applied and there is even the option to create your own conditions.
When using iptables, the '''Filter''' table is important because it contains the following essential '''chains''':<br><br>
