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Re: [v6ops] An Update to Happy Eyeballs

神明達哉 <jinmei@wide.ad.jp> Thu, 16 March 2017 00:00 UTC

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From: 神明達哉 <jinmei@wide.ad.jp>
Date: Wed, 15 Mar 2017 17:00:47 -0700
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To: David Schinazi <dschinazi@apple.com>
Cc: IPv6 Operations <v6ops@ietf.org>
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Subject: Re: [v6ops] An Update to Happy Eyeballs
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On Sun, Mar 12, 2017 at 8:53 PM, David Schinazi <dschinazi@apple.com> wrote:

> We've incorporated them into -01, please let us know if they were properly
> addressed.
> https://www.ietf.org/internet-drafts/draft-pauly-v6ops-happy-eyeballs-update-01.txt

I have one quick (and minor) question about the 01 version: in Section
6 it states

   If, during the course of connection establishment, the DNS answers
   change either by adding resolved addresses, or removing previously
   resolved addresses (for example, due to expiry of the TTL on that DNS
   record), the client should react based on its current progress.

Specifically what kind of scenario does this intend to imply?  For
example, consider the following scenario:

1. start a AAAA query for a destination name
2. start an A query for the same name almost at the same time
3. get a response to the AAAA query (set of IPv6 addresses)
4. start establishing a connection for one of the IPv6 addresses
5. get a response to the A query (set of IPv4 addresses)

At step 5, DNS resolution is fully completed.  But the response to the
A query is quite unlikely to affect "previously resolved (IPv6 in this
case) addresses".  At least it shouldn't add any IPv6 address.  The
only possible corner case I can think of is to get an NXDOMAIN to the
A query, which could effectively mean "removing" the IPv6 addresses.
Does the above text specifically mean this case?  Are there other
cases under consideration?  Or is this about the case where multiple
DNS servers are used?

--
JINMEI, Tatuya

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