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TP-LINK TD-8840T Manual

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TD-8840T ADSL2+ Modem Router User Guide
39
¾ Open Protocol: The protocol used for Incoming Port, either TCP, UDP, or ALL (all
protocols supported by the Modem Router).
¾ Status: The status of this entry, Enabled means the Port Triggering entry is enabled.
¾ Modify: To modify or delete an existing entry.
¾ Common Service Port: Some popular applications already listed in the drop-down list of
Open Protocol.
To modify or delete an existing entry:
1. Find the desired entry in the table.
2. Click Edit as desired on the Edit column.
Click the Enable/ Disabled Selected button to make selected entries enabled/ disabled.
Click the Delete Selected button to delete selected entries.
Once the Modem Router is configured, the operation is as follows:
1. A local host makes an outgoing connection to an external host using a destination port
number defined in the Trigger Port field.
2. The Modem 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.
) Note:
1. When the trigger connection is released, the corresponding opened ports will be closed.
2. Each rule can only be used by one host on the LAN at a time. The trigger connection of other
hosts on the LAN will be refused.
3. Open Ports ranges cannot overlap each other.
4.7.3 DMZ
Choose menu “Forwarding→DMZ”, and then you can view and configure DMZ host in the screen
(shown in Figure 4-30).The DMZ host feature allows one local host to be exposed to the Internet
for a special-purpose service such as Internet gaming or videoconferencing. The Modem Router
forwards packets of all services to the DMZ host. Any PC whose port is being forwarded must
have its DHCP client function disabled and should have a new static IP Address assigned to it
because its IP Address may be changed when using the DHCP function.
Figure 4-30
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