RangeMax Dual Band Wireless-N Modem Router DGND3300 User Manual

3-8 Protecting Your Network

v1.0, March 2009
Blocking Access to Internet Services

The modem router allows you to block the use of certain Internet services by computers on your

network. This is called service blocking or port filtering. 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 your network sends a request for service to a server computer on the

Internet, 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.

LAN users
(Outbound
Services only)
These settings determine which computers
on your network are affected by this rule,
based on their source (LAN) IP address.
Select the desired option:
•Any. All local IP addresses are covered
by this rule.
•Address range. If this option is selected,
you must enter the Start and Finish
fields.
•Single address. Enter the required
address in the Start fields.
Send to LAN
Server (Inbound
Services only)
Enter the IP address of the PC or Server on
your LAN that will receive the inbound traffic
covered by this rule.
WAN Servers These settings determine which Internet locations are covered by the rule, based on their
destination (WAN) IP address. Select the desired option:
•Any. All local IP addresses are covered by this rule.
•Address range. If this option is selected, you must enter the Start and Finish fields.
•Single address. Enter the required address in the Start fields.
Log This determines whether packets covered by this rule are logged. Select the desired
action:
•Always. Always log traffic considered by this rule, whether it matches or not. This is
useful when debugging your rules.
•Never. Never log traffic considered by this rule, whether it matches or not.
•Match. Log traffic only it matches this rule. (The action is determined by this rule.)
•Not Match. Log traffic that is considered by this rule, but does not match (The action is
NOT determined by this rule.)

Table3-1. Adding or Editing Firewall Service Rules (continued)

Field Outbound Rules Inbound Rules