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SMC8014WN and SMC8014WN2 Wireless Cable Modem Gateway Administrator Manual
Special Application Menu
Path: Firewall > Special Application
Using the Special Application menu, you can configure the Gateway to detect multiple-
session applications and allow them to pass through the firewall.
For special applications, besides the initial communication session, there are multiple related
sessions created during the protocol communications. Normally, a normal treats the
triggered sessions as independent sessions and blocks them. However, the Gateway can
co-relate the triggered sessions with the initial session and group them together in the NAT
session table. As a result, you need only specify which protocol type and port number you
want to track, as well as some other related parameters. In this way, the Gateway can pass
the special applications according to the supplied information.
Assume, for example, that to use H.323 in a Net Meeting application, a local client starts a
session A to a remote host. The remote host uses session A to communicate with the local
host, but it also could initiate another session B back to the local host. Since there is only
session A recorded in the NAT session table when the local host starts the communication,
session B is treated as an illegal access from the outside and is blocked. Using the Special
Application menu, you can configure the Gateway to co-relate sessions A and B and
automatically open the port for the incoming session B.
The maximum allowed triggers is 50. To enable the special application function, check the
Enable Triggering checkbox and click Apply. To disable it, uncheck the Enable Triggering
checkbox and click Apply.
Note: The Special Application submenu is not available in the menu bar if
Enable Firewall Module is disabled in the Security Settings (Firewall) menu (see
page 57).
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