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