estimation of number of DFZ IPv4 routes at peak in the future

Justin Krejci jkrejci at
Fri Mar 11 17:39:21 CST 2011

On Wed, 2011-03-09 at 09:32 -0500, John Curran wrote:
> On Mar 9, 2011, at 12:43 AM, Majdi S. Abbas wrote:
> > On Wed, Mar 09, 2011 at 12:44:05PM +0900, Randy Bush wrote:
> >> i am more of a pessimist.  i suspect that there will be enough v4-only
> >> destinations out there that multi-homed enterprises fronting onto 
> >> dual-stack backbones will announce teenie bits of v4 so they can nat64.
> > 
> >    I'll take this one a little further.
> > 
> >    I suspect that as we reach exhaustion, more people will be
> > forced to break space out of their provider's v4 aggregates, and
> > announce them, and an unfiltered DFZ may well approach the 'million'
> > entries some vendors now claim to support.
> This matches my personal view (and could be viewed as 
> "success" compared to the 5M estimate of Mr. Herrin...)
> /John

Are people going to be relying on using default-routing then in the
future if they don't upgrade routers to handle large routing table
growth? Or perhaps forgo dual-stack and have a separate physical IPv6
BGP network from IPv4? Are there any other strategies?

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