[dns-operations] Signaling client protocol to authority

Patrick W. Gilmore patrick at ianai.net
Sun Jan 16 18:46:26 UTC 2011

On Jan 16, 2011, at 1:34 PM, Jim Reid wrote:
> On 16 Jan 2011, at 17:04, Patrick W. Gilmore wrote:
>> It is much better to give back an A record when the user can use a quad-A than handing back a quad-A when the user only has v4.
> This is all very well but it's not how the DNS works. Why would a server choose to put an A record in the Answer Section when it was asked for AAAA (or vice versa)?

The problem is end users who have no v6 connectivity ask for quad-A, and they do it over v4.

As I explained earlier, if they ask for a quad-A over v6, it is far more likely they can actually reach the web server over v6.


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