Integration of mobile ad hoc network and the Internet allows
ubiquitous Internet services for mobile users in a MANET. We
proposed a new gateway discovery and selection scheme to rescue the
network from the problems of current schemes. Our scheme uses a
triggered broadcast of gateway advertisement messages at the
gateways when hit by gateway discovery messages. We also bounded
the dissemination of the gateway advertisement messages up to the
requesting mobile node from the gateway. We combined hop count,
traffic load (interface queue length), and the total number of
neighbors along a route to the gateway in order to formulate a new
metric for gateway selection. Our metric chooses the gateway which
is not only closest but also has the route from the mobile node
with less load and less dense. Simulation results show that our
scheme outperforms other schemes.
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