3Com ADSL Wireless 11g Firewall Router User Guide - Page 61

Virtual Servers, TCP or UDP.

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Firewall 61 If your application is not listed, you will need to check with the application vendor to determine which ports need to be configured. You can manually input this port information into the Router. To do this: 1 Specify the trigger port (the one used by the application when it is initialized) in the Trigger Port column, and specify whether the trigger is TCP or UDP. 2 Specify the Public Ports used by the application, that will need to be opened up in the firewall for the application to work properly. Also specify whether these ports are TCP or UDP. 3 Click Apply. Virtual Servers Figure 50 Virtual Servers Screen This function allows you to route external (Internet) calls for services such as a web server (port 80), FTP server (Port 21), or other applications through your Router to your internal network. Since your internal computers are protected by a firewall, machines from the Internet cannot get to them because they cannot be 'seen'. If you need to configure the Virtual Server function for a specific application, you will need to contact the application vendor to find out which port settings you need.

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Firewall
61
If your application is not listed, you will need to check with the
application vendor to determine which ports need to be configured. You
can manually input this port information into the Router. To do this:
1
Specify the trigger port (the one used by the application when it is
initialized) in the
Trigger Port
column, and specify whether the trigger is
TCP or UDP.
2
Specify the Public Ports used by the application, that will need to be
opened up in the firewall for the application to work properly. Also
specify whether these ports are TCP or UDP.
3
Click
Apply.
Virtual Servers
Figure 50
Virtual Servers Screen
This function allows you to route external (Internet) calls for services such
as a web server (port 80), FTP server (Port 21), or other applications
through your Router to your internal network. Since your internal
computers are protected by a firewall, machines from the Internet cannot
get to them because they cannot be 'seen'.
If you need to configure the Virtual Server function for a specific
application, you will need to contact the application vendor to find out
which port settings you need.