This is the place that we actually take action against packets and look at what they contain and DROP or ACCEPT them, depending on their payload. The Filter table should be used for filtering packets GeneRally. For example, we could DROP, LOG, ACCEPT or REJECT packets without problems as in the other tables. There are three chain built in to this table.
The first one is named FORWARD and is used on all non-locally generated packets that are not destined for our localhost (the firewall, in other words).
INPUT is used on all packets that are destined for our local host (the firewall) and OUTPUT is finally used for all locally generated packets.
