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subnet prefix length > 64 breaks IPv6?

Subject: subnet prefix length > 64 breaks IPv6?
From: sthaug at nethelp.no (sthaug at nethelp.no)
Date: Sun, 25 Dec 2011 11:26:08 +0100 (CET)
In-reply-to: <CAPLq3UM+gKAv93efZ=_p3zd8vs87-wCytaMYUPaf6tvGxzksag@mail.gmail.com>
References: <[email protected]> <CALFTrnPa73oPkUuyoWW9GVQNcn9WpE6Y8PvDutawWJKaNS2iQQ@mail.gmail.com> <CAPLq3UM+gKAv93efZ=_p3zd8vs87-wCytaMYUPaf6tvGxzksag@mail.gmail.com>

> > prefixes on the same link. ?Choosing to make use of a 120-bit prefix
> > (for example) will do nothing to protect against a rogue RA announcing
> > its own 64-bit prefix with the A flag set.
> >
> 
> I could not find any "A flag" in the RA. Am i missing something?

It's part of the Prefix Information option. See

     http://tools.ietf.org/html/rfc4861#section-4.6.2

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

References:
- subnet prefix length > 64 breaks IPv6?
  - From: sven at cb3rob.net (Sven Olaf Kamphuis)
- subnet prefix length > 64 breaks IPv6?
  - From: rps at maine.edu (Ray Soucy)
- subnet prefix length > 64 breaks IPv6?
  - From: glen.kent at gmail.com (Glen Kent)

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