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7
ADVANCED CONFIGURATION
DMS-CTC-20131021-0004 v1.0
7.1 Port configuration for applications and services
Introduction
The Gateway allows you to use one Internet connection for multiple computers. This means that all your computers share
one public IP address, as if only one computer were connected to the outside world.
Issue
When the Gateway receives an incoming message, the Gateway has to decide to which computer it has to send this
message.
If the incoming message is a response to an outgoing message originating from one of your computers, the Gateway sends
the incoming message to this computer.
But the Gateway will not be able to resolve the destination if:
The incoming message arrives on a different port as the outgoing message. Then the Gateway will not know that the two
messages are related.
There is no outgoing message.
Solutions
To avoid this problem, the Gateway offers the following solutions:
The Gateway supports automatic device discovery and port configuration for UPnP-enabled devices.
For more information, see “7.1.1 UPnP” on page 56.
The Gateway allows you to assign a port to a device.
For more information, see “7.1.2 Port forwarding” on page 58.
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