Slow WiFi with Android Marshmallow & IPv6?

[Brzozowski, John Jason]

Android is properly trying to query DNS over IPv6 unlike other
devices/OSes.  Most other mobile platforms still prefer the querying of DNS
over IPv4 for A/AAAA RR query types.

On Sun, Apr 24, 2016 at 10:17 AM, Eric Vyncke (evyncke) <evyncke at cisco.com>
wrote:

> Jeroen, Erik and John,
>
> Thanks for the hint. I will advise the ISP to investigate any DNS issue
> (such as not returning an error message when requesting a non-existing
> AAAA) but I wonder why it is linked to that specific Android Marshmallow
> version.
>
> -éric
>
> From: <ipv6-ops-bounces+evyncke=cisco.com at lists.cluenet.de> on behalf of
> "Brzozowski, John Jason" <jjmb at jjmb.com>
> Date: Sunday 24 April 2016 at 16:01
> To: Erik Kline <ek at google.com>
> Cc: Jeroen Massar <jeroen at massar.ch>, IPv6 Ops list <
> ipv6-ops at lists.cluenet.de>
> Subject: Re: Slow WiFi with Android Marshmallow & IPv6?
>
> My customers saw this issue at one point.  We had issues with DNS over
> IPv6.  Bad DNS and/or network configurations.  Once these were fixed, the
> problems cleared up.
>
> On Sunday, April 24, 2016, Erik Kline <ek at google.com> wrote:
>
>> On 24 April 2016 at 19:53, Jeroen Massar <jeroen at massar.ch> wrote:
>> > On 2016-04-24 11:51, Eric Vyncke (evyncke) wrote:
>> >> One of the first Belgian ISP to deploy IPv6 (VOO) is now recommending
>> to
>> >> its Android Marshmallow (6.0.1) users to deactivate IPv6 on their
>> >> residential WiFi CPE... :-(
>> >>
>> >> It appears that the issue is about IPv6 web sites/apps being really
>> >> slower when using IPv6.
>> >
>> > Is it a DNS issue maybe?
>> >
>> > https://www.sixxs.net/faq/dns/?faq=ipv6slowconnect
>> >
>> > As that has been the general cause of "Disable IPv6!!!!!" around the
>> > world for many years already.
>> >
>> > Of course, without more details, little one really can say. Bug number
>> > maybe?
>> >
>> > Greets,
>> >  Jeroen
>> >
>>
>> Yeah, a link to something that eventually leads to a bug report would be
>> good.
>>
>> Also if anybody has adb installed they can just try "adb shell dumpsys
>> connectivity --diag" and see what the over-simplified diagnostic
>> output shows.
>>
>
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