Router solicitation message
8.2.6 This page will explain why router solicitation messages are used.
A host generates an ICMP router solicitation message in response to a missing default gateway. This message is sent using multicast and it is the first step in the router discovery process. A local router will respond with a router advertisement that identifies the default gateway for the local host. Figure identifies the frame format and Figure gives an explanation of each field.
The next page will discuss source quench messages.
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