This might have been brought up and answered before,
my appologies.
It is possible to assign an address with a prefix longer than /64 to an
interface, for instance 2001:16d8:ff97:4::1:2/112.
But, rfc4291 section 2.5.4 Global Unicast Addresses, states:
"All Global Unicast addresses other than those that start with binary 000
have a 64-bit interface ID field (i.e., n + m = 64), formatted as
described in Section 2.5.1. Global Unicast addresses that start with
binary 000 have no such constraint on the size or structure of the
interface ID field."
...Which means that a prefix longer than /64 is not valid.
rfc3627 suggests that one should use avoid using a prefix longer than /64,
meaning that it is "somewhat not invalid".
It seems to be some deployments with router link subnets with
prefixes longer than /64.
(http://www.huque.com/~shuque/doc/penn-ipv6-plan.html).
Could someone enlighten me here, please?
Best regards
Mattias Webjorn Eriksson
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