>I'd like to see an ICMPv6 error message value assigned for the case
>where a node would need to send a packet from a specific address,
>but cannot because that address is anycast (since the other end
>has no other good way of knowing this is the case). One example
>of this is if a node receives a TCP SYN on an anycast address,
>today it apparently has to silently drop the SYN, and the other
>end can't tell why.
>No existing ICMPv6 error message applies to this case.
draft-itojun-ipv6-tcp-to-anycast-01.txt proposes to use addr unreach
(code = 3), but i'm happy to see a new code for anycat case.
itojun
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