Re: [dnssd] When does MDNS/DNS-SD use IPv6?

Erik Kline <ek@google.com> Thu, 19 January 2017 08:29 UTC

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From: Erik Kline <ek@google.com>
Date: Thu, 19 Jan 2017 17:29:16 +0900
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To: Hagen Paul Pfeifer <hagen@jauu.net>
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Cc: "cheshire@apple com" <cheshire@apple.com>, dnssd@ietf.org, Christian Huitema <huitema@huitema.net>
Subject: Re: [dnssd] When does MDNS/DNS-SD use IPv6?
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On 19 January 2017 at 17:16, Hagen Paul Pfeifer <hagen@jauu.net> wrote:
>
>
> Am 19.01.2017 02:13 schrieb Christian Huitema <huitema@huitema.net>et>:
>
>
>> The Apple open source mDNSResponder implementation sends both queries in
>> parallel.
>
> OK. But if we all nodes do that and if all nodes publish their records on
> both IPv4 and IPv6, there is going to be a fair amount of duplicate traffic.
> More on potential fixes later in this message.
>
>
> Fair amount of what? DNS, OK, but considering all traffic it is probably
> neglicable. As always: it is a compromise between implementation complexity,
> already deployed software, new extensions, new bugs and other factors. And
> hoping that in a not so far future IPv6 only networks exists.

On networks with even moderate numbers of hosts it can be quite a lot
of traffic.  This is frequently a concern for battery impact (to those
devices that are primarily battery powered).  (We see bug reports
about this stuff.)