proposed text...
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o An anycast address must not be used as the source address of an
IPv6 packet. o An anycast address must not be assigned to an IPv6 host, that
is, it may be assigned to an IPv6 router only.with
- An anycast address is used for very short exchanges, such as single packet each way (DNS) or rendezvous exchanges (IPsec/IKE/ISAKMP). Use of Anycast as a source address in longer exchanges runs the risk of routing changing in the network and the stated shared by the communicating end stations being lost. For longer exchanges with an anycast service, a protocol must be defined that communicates to the originator of the session a stable address of the system it is communicating with, to be used for the substance of the exchange.
- An anycast address is never advertised to the network by a host in neighbor discovery, but rather by a router or host advertising itself as a reasonable router to that end station. If routing fails, fail-over to another interface serving the address is this automatic.
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