RE: Source address selection insufficient?

["Christian Huitema" <huitema@windows.microsoft.com>]

> > > Once you modify the hosts at both ends why not also provide
connection
> > > rehoming?
> >
> > Sure. But how does this relate to the problem at hand currently?
> 
> I'm trying to understand whether we need ingress filtering avoidance
> (such as the general case of source-based routing) even once we
> have a connection rehoming solution.
> 
> One reason we might need that is when only one end of the
communication
> implements multi6.

This is indeed a scenario that we must support! 

I personally find that a solution to ingress filtering is the necessary
first step to multi-homing.

The normal approach to multi-homing is multi-addressing: provide each of
the site's hosts with the possibility to configure multiple IPv6
addresses, from each of the providers' prefixes. But in the absence of a
proper solution to ingress filtering, a site doing that will experience
a loss in service: after multi-homing, some connections will
mysteriously fail. This is bad. 

As an industry, we should consider the multi-homing sites as our best
customers: they are buying more services from more providers, deploying
more equipment, probably running more software. The minimum we can do
is, make sure that someone who buys more does not experience a loss in
service!

-- Christian Huitema