Firewall Tutorial; General Firewall Terms; Basic Ip Packet Components - Netopia 2200 series Software User's Manual

Firewall Tutorial

General firewall terms
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Filter rule: A filter set is comprised of individual filter rules.
Filter set: A grouping of individual filter rules.
Firewall: A component or set of components that restrict access between a protected net-
work and the Internet, or between two networks.
Host: A workstation on the network.
Packet: Unit of communication on the Internet.
Packet filter: Packet filters allow or deny packets based on source or destination IP
addresses, TCP or UDP ports.
Port: A number that defines a particular type of service.

Basic IP packet components

All IP packets contain the same basic header information, as follows:
146
Note:
Breakwater Basic Firewall (see
does not make use of the packet filter support and can be used in addition to
filtersets
Source IP Address
Destination IP Address
Source Port
Destination Port
"BreakWater Basic Firewall" on page
163.176.132.18
163.176.4.27
2541
80
125)