[ipv6-wg at ripe.net] RE: [6bone] /20 allocated - update your BGP filters!

Hi,

On Tue, May 11, 2004 at 11:37:34AM +0200, Iljitsch van Beijnum wrote:
> >I appreciate that approach.  It has the potential to keep down the
> >number of routes - but even if that doesn't work out, due to different
> >per-country routing policies, it definitely served to wake up those
> >people that still think "a /23 allocation per RIR is plenty".
> 
> Still, a /20 allows for 268435456 /48s. Is Telia really going to give 
> half of the inhabitants of Europe a /48?

If you count in hierarchy loss - and there *will* have to be multiple
layers of hierarchy and aggregation - the maximum subscribers you 
can reasonably connect are more likely to be in the "20-50 Millions" 
range.  

And this is a fairly realistic number for an ISP that's connecting
millions of DSL and dial-up end-users in a large number of countries.

What I really don't understand is why people are getting so negatively
upset about /20s - what do you *want*?  1 billion /32s in the global
routing table, making "efficient" and "conservative" use of FP 001 ?

Gert Doering
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