When using iptables, the '''Filter''' table is important because it contains the following essential '''chains''':<br><br>
*'''INPUT:'''<br>Data is checked against the INPUT chain to see if it is '''allowed into''' the PC<br><br>*'''OUTPUT:'''<br>Data is checked against the OUTPUT chain to see if it is <u>allowed to go outside</u> of the PC<br><br>*'''FORWARD:'''<br>PC is acting as a router it does not actually send or receive data, it <u>FORWARDS</u> data from one machine to another
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