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TP-LINK CPE220 Manual

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Chapter 5 Network Tab
the Internet to this service port will be redirected to the LAN server. Virtual
Server function not only makes the users from I
nternet visit the local area
network, but also keeps network security within the intranet as other services
are still invisible from Internet. The LAN server must have a static or reserved IP
Address because its IP Address may change when using the DHCP function.
To use the virtual server:
1. Click Add in the table of Virtual Server.
2. Enter the IP Address of the PC providing the service application.
3. Enter the Internal Port number of the PC running the service application.
You can leave it blank if the Internal Port is the same as the Service Port, or
enter a specific port number.
4. Enter the numbers of external Service Port. You can type a service port or a
range of service ports (the format is XXX – YYY, XXX is the start port, YYY is
the end port). Internet users send request to the port for services.
5. Choose the one of the protocols used for this application: TCP, UDP, or
TCP/UDP.
6. Click OK after finishing the configuration.
Select the added entries, you can edit or delete them.
Port Trigger Check the Enable box to use the port trigger function. Due to the existence of
the firewall, some applications such as online games, video conferences, VoIPs
and P2P downloads need the device
to configure the forwarding to work
properly, and these applications require multiple ports connection, for single-
port virtual server cannot meet the demand. Port trigger function comes at this
time. When an application initiates a conne
ction to the trigger port, all the
incoming ports will open for subsequent connections.
Once configured, 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 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 Port field.
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