Yahoo and IPv6

Dan Wing dwing at
Tue May 17 05:14:39 UTC 2011

> -----Original Message-----
> From: George Bonser [mailto:gbonser at]
> Sent: Monday, May 16, 2011 2:10 AM
> To: Iljitsch van Beijnum; Owen DeLong
> Cc: NANOG list
> Subject: RE: Yahoo and IPv6
> >
> > Because that way the IPv4 and IPv6 swarms remain disconnected in the
> > absence of some dual stack peers. (I.e., if the swarm is small and
> > you're the only IPv6 participant.)
> >
> > It would be much better if you could go from IPv6 to IPv4 through a
> > NAT64.
> The problem is when the client is handed an explicit address rather
> than
> a host name.  In that case, there needs to be some standard environment
> variable for "IPv64 Prefix" that applications can query.
> For a browser this might be something like the configured proxy.  Maybe
> an OS such as Windows might have a registry value for this.  Maybe
> Linux
> and other unix-like variations could have a sysctl for that.
> There should be some standard way for a native v6 host to determine the
> v6 to v4 prefix to use in a NAT64 environment.

That need is acknowledged and being worked,


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