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Mobile users are expected to demand access to the Internet anywhere and anytime. In a MANET context, a device which is about to connect to external hosts needs the route to the element which communicates the MANET with the Internet. This element is the Internet Gateway. To inform about its presence as well as about some configuration parameters, the Gateway sends MRA messages. In a similar way to ad hoc routing protocols, the Gateway can generate the messages on demand (reactively), periodically (proactively) or combining both previous strategies in a hybrid gateway discovery. Specifically, in the hybrid gateway discovery, the Gateway periodically sends the MRA messages in a restricted area.
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