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SMC8014WN and SMC8014WN2 Wireless Cable Modem Gateway Administrator Manual
Figure 37. Trigger Menu
Table 17. Trigger Menu Options
Option Description
Name Name for identifying the trigger. The name is for reference purposes only and should let you
identify this trigger from others you may define..
Type The type of protocol you want to use with the trigger. For example, to track the H.323
protocol, the protocol type should be TCP. Choices are:
• TCP (default)
• UDP
Port Number From and To port ranges of the special application. For example, to track the H.323 protocol,
the From and To ports should be 1720.
Target Port From and To port ranges for the target port listening for the special application.
Interval Interval between 50 and 30000 between two continuous sessions. If the interval exceeds this
time interval setting, the sessions are considered to be unrelated.
IP Replacement Select the IP replacement according to the application. Some applications embed the source
host's IP in the datagram that prevent NATs from translating the IP address in the datagram.
To make sure the network address translation is complete, IP replacement is necessary for
these special applications, such as H.323.
Allow sessions initiated from/to the
3
rd
host
Enable (check) or disable (uncheck) sessions to be initiated from or to a third host. To prevent
hacker attacks from a third host, this feature usually is disabled (not checked). However,
some special applications, such as MGCP in a VOIP application, permit a session initiated
from a third host. For example, assume Client A is trying to make a phone call to host B.
Client A tries to communicate with the Media Gateway Controller (MGC) first and provides
host B's number to MGC. The MGC checks its own database to find B and communicates
with B to provide B the information about A. B uses this information to communicate directly to
A. So initially, A is talking to MGC, but the final step has B initiating a session to A. If the third-
party host-initiated session is not allowed in this example, the whole communication fails.
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