Why no IPv6-only day (Was: Protocol-41 is not the only tunneling protocol)

Mark Andrews marka at isc.org
Mon Jun 6 21:23:24 UTC 2011

In message <alpine.BSF.2.00.1106060732190.68892 at goat.gigo.com>, Jason Fesler wr
> > But anyway, just consider it: a portion of the major websites go
> > IPv6-only for 24 hours. What happens is that well, 99% of the populace
> > can't reach them anymore, as the known ones are down, they start calling
> > and thus overloading the helpdesks of their ISPs.
> Won't happen this year or next.  Too much money at stake for the web 
> sites.  Only when IPv4 is single digits or less could this be even 
> remotely considered.  Even the 0.05% hit for a day was controverial at 
> $dayjob.

IPv4 will never reach those figures.  IPv6 isn't preferenced enough for
that to happen and IPv6-only sites have methods of reaching IPv4 only
sites (DS-Lite, NAT64/DNS64).
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org

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