Port Redirection - D-Link DSL-504 User Manual

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
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

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.
Port Redirection Window
DSL-504 ADSL Router User's Guide
in the pull down
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