[ppml] IPv6>>32

Leo Bicknell bicknell at ufp.org
Tue May 17 15:07:54 EDT 2005

Cable and Wireless just made a presentation at Nanog about their IPv6
deployment.  You can find it at:


Slide 6, entitled "Addressing" has some interesting facts about how
they have chosen to deploy IPv6, which includes use of their /21
(11 bits larger than the default /32 allocation).

While I think all the numbers are interesting to talk about, two points
are particularly interesting with respect to my original post on this
thread.  I quote:

"All links, regardless of interface type, do get /64 assigned to
simplify operations, IP admin, DNS and management."

"No stateless autoconfig anywhere."

So, they are assigning /64's everywhere, yet explicitly not using
the one feature the fixed subnet size (currently) enables.  So, for
something that in IPv4 we can number with a single bit (using a /31
on a point to point link), they are using 64 bits to do the same

       Leo Bicknell - bicknell at ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
Read TMBG List - tmbg-list-request at tmbg.org, www.tmbg.org
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