RE: Multihoming Issues

["Christian Huitema" <[e-mail]>]

> The relationship is that DNS is acting as an index service
> for IPv6 addresses. In doing so it treats them as simple
> hierarchical  addresses, i.e. like fat IPv4 addresses.
> 
> The question as to whether that is the correct handling of
> IPv6 addresses is a valid one. This thread started with
> exactly such a question being raised, but the rationale on
> how DNS *could* be optimized for IPV6 was not spelled out.

There is no IPv6 service that guarantees that the identifiers are
actually world-wide unique. In fact, there is ample evidence that they
often will not be. Poorly configured interface cards are known to have
phony IEEE-802 addresses; privacy addresses are random numbers that are
only statistically unique; configured addresses may use user assigned
values. In all these cases, local collisions can be detected, global
collisions cannot be. 

There is also no requirement that a given multi-homed hosts combines the
same identifier with different prefixes. Privacy advocates will no doubt
argue that a multi-homed host should associate different identifiers
with different provider prefixes, so it cannot be tracked by
big-brother.

-- Christian Huitema