The ICMP Router Discovery Protocol (IRDP) uses ICMP router advertisements and router solicitation messages to allow a network host to discover the addresses of operational gateways on the subnet. IRDP is an alternative gateway discovery method that eliminates the need for manual configuration of gateway addresses on network hosts and is independent of any specific routing protocol.
It is important to remember that ICMP router discovery messages do not constitute a routing protocol. Instead, they enable hosts to discover the existence of neighboring gateways, but do not determine which gateway is best to reach a particular destination.
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