C
HAPTER
4
| Configuring the Router
Forwarding
– 77 –
Figure 60: Port Triggering
Once the Router is configured, the operation is as follows:
1.
A local host makes an outgoing connection using a destination port
number defined in the Trigger Port field.
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 defined in the Incoming Ports field.
◆
Trigger Port
- The port for outgoing traffic. 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.
◆
Incoming Protocol
- The protocol used for Incoming Ports Range,
either TCP or UDP, or ALL (all protocols supported by the Router).
◆
Status
- The status of this entry either Enabled or Disabled.
To add a new rule, follow the steps below.
1.
Click the “Add New” button, the next screen will pop-up as shown in
.
2.
Select a common application from the Common Applications drop-down
list, then the Trigger Port field and the Incoming Ports field will be
automatically filled. If the Common Applications do not have the
application you need, enter the Trigger Port and the Incoming Ports
manually.
