How dynamic is a dynamic IPv6 address?

Tue Jul 26 23:24:21 UTC 2011

How dynamic will dynamic addresses be under IPv6?

IPv4 addresses, with most ISP's, change relatively rarely.  Once
or twice a year is not atypical, and sometimes they go for much
longer.  The impression I get is that most of the need to renumber
is driven by technological needs, either the subnet sizes and need
to use all addresses in a block, or the combining and splitting of
"segments" (channels, etc) on the cable infrastructure.

With a /64 on each segment the former goes away.  Subnet size will
never dictate renumbering.  The segments issue could keep driving
it, but it's not hard to imagine a world where your router gets a
dynamic IP out of a /64, and then does DHCP-PD to get your home
block.  This block may in fact never need to change.

Basically, in IPv6, even if addresses are assigned "dynamically"
(really automatically) won't the consumer pretty much always have
the same address for the lifetime of their service, for the majority
of consumers?

-- 
       Leo Bicknell - bicknell at ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
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