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DSL-504 ADSL Router User’s Guide

Finally you can specify individual protocol ports or an entire range of protocol

ports to be blocked for the Source or Destination. Type the Start Port number

in either the Source or Destination row. If there is no port specified in the Start

Port column, the filter rule will be ignored. Use the <, >, = or ≠ in the pull down

menu to specify the port or range of ports to be filtered. Use the following guide

to define the port or port range:

< : specifies the port numbers less than and equal to the Start Port

number

> : specifies the port numbers greater than and equal to the Start Port

number

= : sets the port number equal to the Start Port if there is no End Port

specified; if an End Port number is specified, this defines a range of ports

to filter. The range is defined as the port numbers between the Start Port

and End Port, including the Start and End Port numbers.

≠ : the port number does not equal to the Start Port if there is no End Port

specified; if an End Port number is specified, this defines a range of ports

not to filter. The range is defined as the port numbers between the Start

Port and End Port, including the Start and End Port numbers.

Port Redirection

Port Redirection Window

The Port Redirection feature of the Router is used in conjunction with NAT to

improve security and efficiency. Port redirection can be used to direct potentially

hazardous packets to a proxy server outside your firewall. For example, it is

common practice to direct HTTP packets to a designated HTTP server in the

DMZ. Other common applications might include directing incoming SMTP

packets to an Email server for data scrutiny and improved network efficiency.

Click the Add button in the Port Redirection window to access the Redirect Port

menu.