Slow WiFi with Android Marshmallow & IPv6?

[Matthew Huff]

Remember, Android developers refuse to  implement  DHCPv6 and so can only get DNS server info  from RDDNS (rfc6106).  Since the  number RA devices that support RFC6106 are limited, this provides another  problem set for Android devices  and IPv6

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From: ipv6-ops-bounces+mhuff=ox.com at lists.cluenet.de [mailto:ipv6-ops-bounces+mhuff=ox.com at lists.cluenet.de] On Behalf Of Brzozowski, John Jason
Sent: Sunday, April 24, 2016 10:21 AM
To: Eric Vyncke (evyncke) <evyncke at cisco.com>
Cc: Erik Kline <ek at google.com>; Jeroen Massar <jeroen at massar.ch>; IPv6 Ops list <ipv6-ops at lists.cluenet.de>
Subject: Re: Slow WiFi with Android Marshmallow & IPv6?

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<mailto: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<mailto:ipv6-ops-bounces+evyncke=cisco.com at lists.cluenet.de>> on behalf of "Brzozowski, John Jason" <jjmb at jjmb.com<mailto:jjmb at jjmb.com>>
Date: Sunday 24 April 2016 at 16:01
To: Erik Kline <ek at google.com<mailto:ek at google.com>>
Cc: Jeroen Massar <jeroen at massar.ch<mailto:jeroen at massar.ch>>, IPv6 Ops list <ipv6-ops at lists.cluenet.de<mailto: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<mailto:ek at google.com>> wrote:
On 24 April 2016 at 19:53, Jeroen Massar <jeroen at massar.ch<mailto: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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