Chapter 3: Protecting Your Network | 45
N300 Wireless Gigabit ADSL2+ Modem Router DGN3500 User Manual
Services
Services are functions performed by server computers at the request of client computers. For
example, Web servers serve Web pages, time servers serve time and date information, and
game hosts serve data about other players’ moves. When a computer on the Internet sends
a request for service to a server computer, the requested service is identified by a service or
port number. This number appears as the destination port number in the transmitted IP
packets. For example, a packet that is sent with destination port number 80 is an HTTP (Web
server) request.
The service numbers for many common protocols are
defined by the Internet Engineering
Task Force (IETF) and published in RFC1700, “Assigned Numbers.” Service numbers for
other applications are typically chosen from the range 1024 to 65535 by the authors of the
application.
Although the wireless modem router already holds a list o
f many service port numbers, you
are not limited to these choices. Use the following procedure to create your own service
definitions.
To add or change a service:
1. L
og in to the wireless modem router at its default LAN address of http://192.168.0.1
with its default user name of admin, and default password of password, or using
whatever password and LAN address you have chosen for the wireless modem router.
2. Below the Security heading,
select Services to display the Services screen shown in the
following figure:
Figure 22.
• To create a new service, click the Add Custom Service button.
• T
o edit an existing service, select its button on the left side of the table, and click Edit
Service.
• T
o delete an existing service, select its button on the left side of the table, and click
Delete Service.
3. Use the Add Service
s screen to define or edit a service.
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