3Com 3CRWE554G72 manual Special Application Settings Screen

66CHAPTER 5: GATEWAY CONFIGURATION

trigger port and incoming port(s), where traffic on the trigger port tells the firewall to open the incoming ports.

Each defined Special Application only supports a single computer user, and up to 10 Special Applications can be defined. Any incoming ports opened by a Special Application trigger will be closed after five minutes of inactivity.

To configure special applications:

1Click New.

2Select the applications from the pull-down list. (Figure 49)

Figure 49 Special Application Settings Screen

Or select Other to specify a suitable name for the special application and then enter a value in the Trigger Port and Incoming Ports text boxes (Figure 49). These values correspond to the outbound port numbers issued by the application.

The port numbers are specified using a comma-separated list, with hyphens to denote port number ranges. So for example, entering 2, 3, 5-7would cause ports 2, 3, 5, 6, and 7 to be activated.

The Gateway will automatically allow FTP and NetMeeting sessions. You do not need to configure these as Special Applications.