> On Mar 31, 2010, at 3:19 PM, Dan Wing wrote:
> 
> > Any host that sends its AAAA queries over IPv4 would lose
> > IPv6 connectivity.
> 
> Isn't this a misdirection?   
> 
> I suspect it's more like: any (address family agnostic) 
> clients of a dual stacked nameserver will (non?) 
> deterministically lose IPv6 connectivity to DNS-determined 
> destinations.
> 
> ie, even if I only send DNS over IPv6 to my recursive 
> nameserver, if it is dual stacked (often beyond my control), 
> and for this specific query it prefers IPv4, then I will not 
> get an answer for my AAAA under this proposal.

It's likely cached by the ISP's nameserver, so it would work
fine under Igor's proposal.  And even if not cached, I would 
expect the content provider's authoritative DNS server to have 
whitelisted both IPv4 and IPv6 addresses of the ISP's 
nameservers.

-d

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