[ppml] Re: [address-policy-wg] Is the time for conservation over?

Owen DeLong owen at delong.com
Mon Oct 27 11:54:53 EST 2003

> With IPv6 we are somewhat smarter. To begin with, all ISP
> allocations are the same size (/32) and they all come out
> of a /29 reservation. The ISP's allocation can grow 8 times
> before we need to use discontiguous blocks. End users are
> less likely to get an allocation from the registry because
> with their /48 from their ISP they can build huge internal
> networks and with IPv6 they can use a second /48 from another
> ISP to assign additional addresses to every one of their
> IPv6 hosts and have a functional form of multihomed connectivity.

I am confused by this statememt, and, it has been one of the things
on my list of "things I've heard about v6 that don't yet make
sense to me" for a while, so, I'm finally going to ask it here...

How is this a functional form of multi-homed connectivity?

If I have a box with two /128s assigned to it, how does it know
which one corresponds to the provider that is up and routing
packets and not to use the one that is down at the moment?

To me, the whole point of multihoming is reliability.  That means,
my packets get through as long as at least one provider is up and
has reachability to/from the peer I want to talk to.  Does v6 require
me to run a routing protocol on EVERY host in order to do local
address selection for sourcing new conversations?

Seriously, I'm not trying to stir the pot, I just don't understand
this yet, and, now I need to know to make useful contribution to the

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