Firewall tutorial, General firewall terms, Basic ip packet components – Netopia 2200 User Manual
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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 suppor t 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 por ts.
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 Por t
2541
Destination Por t
80