Re: ULA-C (Was: Re: IPv6 will never fly: ARIN continues to kill it)

[Lixia Zhang <lixia at CS.UCLA.EDU>]

On Sep 18, 2007, at 8:09 AM, Tony Hain wrote:

> Jari Arkko wrote:
> > Lixia,
> >
> > > I'm just catching up with this thread today: If I summarize my
> > > understanding from the above in one sentence: there seems a  
> > > perceived
> > > difference between PI and ULA-C prefixes, which, as far as I can  
> > > see,
> > > does not exist.
> > >
> > > Whether a unique prefix is/not globally routable is determined by
> > > whether it gets injected into the routing system, no matter how  
> > > it is
> > > labeled.
> >
> > Right. Or we can try to label it, but that labeling
> > may not correspond to what is actually done with
> > it.
>
> If you don't label it there is no clearly agreed way to filter  
> these out if
> you don't want them.

I'd agree that, ideally speaking, one would prefer using simple  
filtering rules.

However as Jari already pointed out, whatever label one puts on a  
prefix may not correspond to what is done with it, *especially* as  
time goes.
(a motto I heard from my high school son, "the only thing that does  
change in life is change" :-)

and I would not attempt to bundle opinions regarding UCL-C and PI (I  
saw Ted already showed an example).  Furthermore, we are all in this  
continuing process of understanding their implications in this  
complex, exciting, and constantly changing Internet.

> The people that are fighting having ULA-C are the same ones that  
> don't want
> PI, and they are trying to force ULA-C == PI so they can turn that  
> argument
> around and say 'we told you PI was a bad idea' when there is no way to
> filter out what would have been ULA-C. If you really believe there  
> is going
> to be a routing system problem, then you absolutely have to support  
> ULA-C
> because it is the only way to enforce keeping private space private.
>
> Tony


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