The FILTER table should be used exclusively for filtering packets. For example, we could DROP, LOG, ACCEPT or REJECT packets without PROBLEMS, as we can in the other tables. There are three CHAINS 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 local host (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.

The filter table should be used exclusively for filtering packets. For example, we could DROP, LOG, ACCEPT or REJECT packets without problems, as we can in the other tables. There are three chains 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 local host (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.