INTERNET CONTROL MANAGEMENT PROTOCOL (ICMP)
A relatively new ICMP operation is the router discovery feature (RFC 1256). It entails a host, upon being installed and bootstrapped onto a network, sending an ICMP router solicitation message. The concept is shown in Figure C-11. It is sent as a broadcast or multicast message. Any router on the same subnet responds with a router advertisement message. This message contains the router's IP address (or addresses) and a preference level for which address the host should when sending traffic to that router. The preference level field can be set to x80000000 to indicate that an address is not to be used as a default router address. The lifetime field in the advertisement informs the receivers how long (in ...
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