[dns-operations] To A or to AAAA - was Re: Signaling client

[Tony Finch]

On Wed, 19 Jan 2011, Joe Abley wrote:
> On 2011-01-19, at 09:38, Mark Andrews wrote:
>
> > 99.999% of AAAA lookups work fine.
>
> Are there public test results that confirm this?

I just took a sample of 10000 different domain names from my mail server
logs. 0.8% of the AAAA lookups returned SERVFAIL or timed out. If I don't
uniquify the domain names I get a failure rate of 0.5%.

This probably doesn't correspond very well to the query pattern on a
normal recursive DNS server. Also I did not count other failure modes such
as returning NXDOMAIN when the domain name has A records but not AAAA.

Tony.
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