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M2M Cellular Gateway
Scenario Application Timing
When one client host in the Intranet wants to run peer‐to‐peer applications, like
multiplayer gaming, the NAT gateway needs the UPnP function to automatically setup
or remove port mapping rules in the gateway.
Scenario Description
Usually, the active port service attempt to access the gateway from the Internet will be
ignored by the gateway for security.
Normal NAT mechanism has the connection tracking feature to direct the response
packets from the Internet back to the source end of request packets in the Intranet.
Once one application in the Intranet host needs an additional service port to be
activated at the WAN interface of the gateway, it will ask the gateway to do that by
using UPnP protocol. Then the Internet server can use the service port to contact the
application for data communication.
Parameter Setup Example
Following table lists the parameter configuration as an example for the NAT Gateway in
above diagram.
Use default value for those parameters that are not mentioned in the table.
Configuration Path
UPnP
Scenario Operation Procedure
In above diagram, the "NAT Gateway" is the gateway of Network‐A and the subnet of its
Intranet is 10.0.75.0/24. It has the IP address of 10.0.75.2 for LAN interface and
118.18.81.33 for WAN‐1 interface.
There is one gaming station in the Intranet and a game server in the Internet. A gaming
application is executed and data is communicated between the gaming station and
server. The gaming application needs more service ports to be activated in the gateway,
so that the gaming server can send data to the station actively via those service ports.
At first stage, the gaming server sends an active accessing for service port 1000 to the
NAT Gateway, the gateway ignores it since the service port 1000 is deactivated at
current stage.
When the gaming has not be executed yet, the NAT mechanism in the gateway has its
connection tracking feature to direct the response packets from the Internet back to
the source end of request packets in the Intranet.
Once the gaming application in the Intranet host is executed and it needs an additional
service port, like 1300, to be activated at the WAN interface of the gateway, it will ask
the gateway to do that by using UPnP protocol.
Finally, the gaming server can use the service port to actively contact the application in
the gaming station for data communication.
UPnP provides a set of networking protocols for networked devices to discover each other's
Index skipping is used to reserve slots for new function insertion, when required.
[UPnP]‐[Configuration]
■ Enable
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