WatchGuard Technologies WatchGuard SOHO and SOHO | tc - Manual (Page 46)

How does information travel on the internet?
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address of the WatchGuard site is 209.191.160.60 while the domain
name is www.watchguard.com.
Protocol
A protocol defines how a packet is bundled up and packaged for
shipment across a network. The most commonly used protocols
are Transmission Control Protocol (TCP) and User Datagram
Protocol (UDP). In addition, there are special protocols, such as IP,
which are used less frequently.
Port number
The port number alerts the computers at both the sending and
receiving end how to handle the packet.
Services
A service is the combination of protocol(s) and port numbers
associated with a specific application or communication type. To
facilitate configuration of your SOHO, WatchGuard lets you select
pre-configured versions of several commonly used services.
WatchGuard SOHO services
The WatchGuard SOHO enables you to customize what is allowed
both incoming and outgoing through your firewall. With this
feature, you can narrowly define what kind of communication is
permitted between computers on the Internet and computers on
your private network.
To facilitate configuring your SOHO, WatchGuard identifies
several commonly used services. A service is the combination of
protocol(s) and port numbers associated with a specific application
or communication type.