>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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