23
4-8 Special Applications
This feature is for Internet applications which normally cannot work through the built-in firewall. If an Internet application does not work, you can try defining it here. You
will need detailed information about the application from the provider of the service or application. Note that the terms "Incoming" and "Outgoing" refer to traffic from the
client (PC) viewpoint.
Figure 22. Special Applications
Operation is as follows:
1. When outgoing traffic from a PC uses an outgoing port defined as a Special Application, the Router records the PC and Special Application.
2. When an incoming connection is received which uses an incoming port for that Special Application, that traffic is forwarded to the PC. (Without the Special Application
entry, the incoming traffic would be discarded.)
Note
: Only 1 PC can use a Special Application at any time. After each use, there will be a "time-out" period before the next PC can use the same Special Application.
Each Special Application must use unique port numbers. You can not enable two Special Applications which use the same port number.
The Special Applications feature is triggered by Outgoing traffic. So it will not help with incoming connections. (The Virtual Server and DMZ features can be used to
determine the destination for incoming connections.)
•
Name
Enter a descriptive name to identify this Special Application. Use the checkbox to Enable or Disable the Special Application as required.
Incoming & Outgoing Ports
• Type
Select the protocol (TCP or UDP) used when you receive (incoming) or send (outgoing) data from the special application or service. (Note: Some applications
use different protocols for outgoing and incoming data).
• Start
Enter the beginning of the range of port numbers used by the application server, for data you receive (incoming) or send (outgoing). If the application uses a
single port number, enter it in both the "Start" and "Finish" fields.
•
Finish
Enter the end of the range of port numbers used by the application server, for data you receive (incoming) or send (outgoing).
ENGLISH
