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Configuring Your Gateway

SMCD3GN2 Wireless Cable Modem User Manual

Configuring Special Applications

Using the Special Application menu, you can configure the Gateway to detect port triggers

for detect multiple-session applications and allow them to pass 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.

To display the Special Applications menu, click Firewall in the menu bar and then click the

Special Application submenu. Figure 47 shows an example of the menu.

The maximum number of allowed triggers is 20. 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 73).

SMC Networks SMCD3GN2 User Manual

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