RE: IPv6 prefixes longer then /64: are they possible in DOCSIS networks?

Note that /127 is strongly discouraged in RFC5375 and RFC3627. 3627 suggests using /112 for router links, or /126 at the very most.

Of potential interest, since you bring up RFC3627, is the following draft, and RFC6164: http://tools.ietf.org/html/draft-george-6man-3627-historic-01 http://tools.ietf.org/html/rfc6164 Nathan Eisenberg