NETGEAR DG824M - 802.11b Wireless ADSL Modem, Reference Manual

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Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
5-12 Protecting Your Network
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 DG824M already holds a list of many service port numbers, you are not limited to
these choices. Use the procedure below to create your own service definitions.
How to Define Services
1.
Log in to the gateway at its default LAN address of http://192.168.0.1 with its default User
Name of
admin , default password of password , or using whatever Password and LAN
address you have chosen for the gateway.
2.
Click on the Services link of the Security menu to display the Services menu shown in
Figure 5-9 :
Figure 5-9: Services menu
• To create a new Service, click the Add button.
• To edit an existing Service, select its button on the left side of the table and click Edit.
• To delete an existing Service, select its button on the left side of the table and click Delete.