> for "cross-talk" to occur, is there a presumption of fate-sharing
> on links? e.g. do you presume that a single link will always
> support both v4 and v6?
no, i do not assume that. since this is a document about tunnelling,
IPv4 path could be arbitrary (some of the paths could be IPv4-only
of course) while IPv6 (over IPv4) is one-hop.
itojun
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