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Glossary User’s Manual 153
A networking specification that identifies how the data is to travel. This term is
sometimes used interchangeably with “LAN” to identify the local network.
Filter
The process of matching IP packet header information of incoming packets to a
list of rules and corresponding actions. Either a matching entry is found and the
specified action implemented or the packet is rejected because it did not match
any of the table entries.
This table is stored on the router and the IP packets are checked by going
sequentially down the table entries. When two entries identify the same type of
packet (for instance, having two entries for all web data) the first one found in the
table will be used.
Filter Forward
The filtering table used to list rules affecting IP packets that pass through the
firewall from one network to another.
Filter Input
The filtering table used to list rules affecting IP packets that only arrive at one of
the firewall’s interfaces and is not meant to be passed any further. For example
accessing the built in webserver or a ping to the firewall itself.
Filter Forward
The filtering table used to list rules affecting IP packets that originate from the
firewall. For example responses to pings of the firewall’s interfaces and
responses to remote configuration requests by telnet or the webserver.
Filter User
The filtering table used to group lists of rules that are only used when packets are
sent to the s.
Firewall
A hardware device or software program used to prevent unauthorized access to
your computer or network. These walls are usually used at points where the
network is vulnerable to the general public or hacker attempts to gain access.
These firewalls examine all data packets that pass through it and search them for
characteristics that match pre-defined access rules.