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