Solutions that rely on routing protocols cannot efficiently detect fast enough when a certain link is down and thus is not capable for quick decisions on when to change the link. The only feasible solution is to use predefined routes and predict at all times the best possible routing for all the used links. Decision making criteria for understanding when one network is not good enough has to be highly sophisticated. The router software requirements include also the capability of autonomously control the used modems. The modems tend sometimes to stay in “hanging� mode and look like they are connected to the network, but no data is transmitted. This and other similar dysfunctions need to be detected by the router and software needs to wake the modems up.
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