Slow WiFi with Android Marshmallow & IPv6?

[Ted Mittelstaedt]

Agreed 100% - to it's credit Comcast does that on the -working- CPE 
devices as far as I can tell...

Ted

On 4/24/2016 5:49 PM, Brzozowski, John Jason wrote:
> 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
> <mailto: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 <mailto: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 <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> 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.
>
>
>
>