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Firewall Tutorial
General firewall terms
☛ Note:
Breakwater Basic Firewall (see “BreakWater Basic Firewall” on page 125)
does not make use of the packet filter support and can be used in addition to
filtersets
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:
Source IP Address 163.176.132.18
Destination IP Address 163.176.4.27
Source Port 2541
Destination Port 80