PORT TRIGGERING
Some applications require multiple connections, like Internet
games, video conferencing, Internet calling and so on. These
applications cannot work with a pure NAT router. Port Triggering
is used for some of these applications that can work with an NAT
router. You can set up Port Triggering on this page:
Once confi gured, operation is as follows:
1.- A local host makes an outgoing connection using a
destination port number defi ned in the Trigger Port fi eld.
2.- The router records this connection, opens the incoming port
or ports associated with this entry in the Port Triggering table,
and associates them with the local host.
3.- When necessary the external host will be able to connect
to the local host using one of the ports defi ned in the Incoming
Ports fi eld.
Trigger Port - The port for outgoing traffi c. An outgoing
connection using this port will “Trigger” this rule.
Trigger Protocol - The protocol used for Trigger Ports,
either TCP, UDP, or All (all protocols supported by the
router).
Incoming Ports Range - The port or port range used by
the remote system when it responds to the outgoing
request. A response using one of these ports will be
forwarded to the PC that triggered this rule. You can
input at most 5 groups of ports (or port section). Every
group of ports must be set apart with “,”. For example,
2000-2038, 2050-2051, 2085, 3010-3030.
Fig. 37
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