propose a system that uses a watchdog
and pathrater to examine neighbour behaviour and routing
messages to determine whether an advertised path to a des-tination is valid and reliable. This watchdog and pathrater
system dynamically values the confidence in a route advertised
by a neighbour based on whether that same neighbour is
overheard (in promiscuous mode) passing on messages that
it promised it would. Karakehayov [11] proposes a system
called REWARD that is suitable for use on sensor networks
containing nodes that are able to tune their transmission power.