ICMPv6 Redirect Messages

Because of the different roles of routers and hosts in an IPv6 internetwork, hosts don't need to know very much about routes. They send datagrams intended for destinations on the local network directly, while they send those for other networks to their local routers and let them "do the driving," so to speak.

If a local network has only a single router, it will send all such nonlocal traffic to that router. If it has more than one local router, the host then must decide which router to use for which traffic. In general terms, a host will not know the most efficient choice of router for every type of datagram it may need to send. In fact, many nodes start out with a limited routing table that says to send everything to a ...

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