Addressing plan exercise for our IPv6 course

Fri Jul 23 00:45:43 UTC 2010

On Thu, 2010-07-22 at 20:24 -0400, Valdis.Kletnieks at vt.edu wrote:
> On Fri, 23 Jul 2010 00:33:45 BST, Matthew Walster said:
> > I never saw the point of assigning a /48 to a DSL customer. Surely the
> > better idea would be to assign your bog standard residential DSL
> > customer a /64 and assign them a /56 or /48 if they request it, routed
> > to an IP of their choosing.
> 
> If they're using autoconfigure for IPv6 addresses, what happens if they want to
> share that connection?  Giving them a /64 off the bat means that a very sizable
> fraction of your users are going to call.

Um, but they will have 18 billion billion addresses in that /64. That
should do them, unless they want to subnet in the home. Which is not so
unusual, so while doing a /48 might be overkill, doing a /60 or even
a /56 off the bat is not such a silly idea.

Unless I've misunderstood Matthew, and he was suggesting that the /64 be
the link network. That would indeed effectively give the customer a
single address, unless it was being bridged rather than routed at the
CPE. Not sure bridging it is such a good idea - most people will
probably want their home networks to keep working even if the ISP has an
outage.

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)                   +61-2-64957160 (h)
http://www.biplane.com.au/~kauer/                  +61-428-957160 (mob)

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