Re: DNS & IPv6

One more nail: The retry counter is currently broken in the AAAA->A
switch, resulting in AAAA, AAAA, AAAA, AA, giveup. And this regardless
of how many name servers you have configured. If you have 2 nameservers
either one of them are broken always returning server failure then the
chances for the A lookup to succeed is close to nil.

But the while retry mechanism is broken by design when it comes to
active errors and breaks down if a resolver nameserver is
malfunctioning.

fre 2010-05-14 klockan 21:38 +0200 skrev Henrik Nordström:
> As you may have noticed I have been looking at the IPv6 support in the
> last days, and now I am looking at how we perform DNS queries.
>
> Today we first do an AAAA query, followed by an A query. As we anyway do
> both queries it would be better if we ran both in parallell. The
> benefits of this is twofold:
>
> a) Lower latency.
>
> b) Easier policy on re-transmission
>
> But needs a bit of reshuffling to get done unfortunately, separating the
> actual queries a bit from the lookup.
>
> Regards
> Henrik
Received on Fri May 14 2010 - 20:24:48 MDT