Slow WiFi with Android Marshmallow & IPv6?

[Brzozowski, John Jason]

Operators MUST no advertise DNS server IPv6 addresses if they do not work.
The fix is simple.  I would like to see as much happening over IPv6 as
possible, the last thing I really want to see is more happy (happier) eye
ball implementations.

On Sun, Apr 24, 2016 at 8:35 PM, Lorenzo Colitti <lorenzo at google.com> wrote:

> Android does not behave well when configured with IPv6 DNS servers that do
> not work. This is because it prefers IPv6, does not (yet) ignore
> unresponsive DNS servers, and has quite high resolver timeouts.
>
> One infamous example is a German ISP whose CPE announces an IPv6 address
> in RDNSS but never responds to queries to that address. Perhaps because no
> other operating system has a problem in this situation, the ISP has not
> fixed this, and users have been blaming Android. This is by no means the
> only case, though. Some of you know who you are :)
>
> Future Android releases will likely ignore broken DNS servers. This is
> unfortunate; we'd hoped that ISPs that provision devices with IPv6
> connectivity would be able to ensure that the DNS servers are responsive
> and that as IPv6 matured this problem would go away. Unfortunately it has
> not.
>
> As Erik said, the way to debug this problem would be to have someone
> running 6.0.1 on voo to run "adb shell dumpsys connectivity --diag" and
> open a bug as described at
> https://source.android.com/source/report-bugs.html .
>
> On Sun, Apr 24, 2016 at 11:21 PM, Brzozowski, John Jason <jjmb at jjmb.com>
> wrote:
>
>> 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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