When using iptables, the '''Filter''' table is important because it contains the following essential '''chains''':<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.