>On IPv6-over-IPv4 (IPv6-over-IPv6) Tunnels, is it required to
>send Neighbor Advertisement Messages in response to
>Neighbor Solicitation Messages sent by the other end?
>I am a little confused about this.
since there's no real link-layer address, and there's only one guy
at the other end, there is no need to resolve link-layer address
via NS/NA exchange. packet can go out without waiting for link-layer
address resolution.
however, NS/NA for NUD (neighbor unreachability detection) will be
exchanged. need to check RFC for MUST/SHOULD/MAY for this.
itojun
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