s/MUST no/MUST not/g On Sun, Apr 24, 2016 at 8:49 PM, Brzozowski, John Jason <[email protected]> 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 <[email protected]> > 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 <[email protected]> >> 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) < >>> [email protected]> 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: <[email protected]> on behalf >>>> of "Brzozowski, John Jason" <[email protected]> >>>> Date: Sunday 24 April 2016 at 16:01 >>>> To: Erik Kline <[email protected]> >>>> Cc: Jeroen Massar <[email protected]>, IPv6 Ops list < >>>> [email protected]> >>>> 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 <[email protected]> wrote: >>>> >>>>> On 24 April 2016 at 19:53, Jeroen Massar <[email protected]> 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. >>>>> >>>> >>> >> >
