push apps failing in Android until you disable IPv6

[JORDI PALET MARTINEZ]

No, I think is a different issue.

In our case the problem is happening in an IPv4-only network.

For some reason, some bug (I believe) in the IPv6 stack, is avoiding the phone to get the push notifications, until you unlock the screen.

Disabling IPv6 (even if is actually not being used), kills the problem. By killing IPv6 you disable the stack, and thus no link-local addresses ? But clearly seems a problem related to the way the Android is managing the WiFi when IPv6 is enabled, even if only link-local is available.

Reading the post you provided, it looks like IPv4 is still working well ?

Saludos,
Jordi









-----Mensaje original-----
De: <ipv6-ops-bounces+jordi.palet=consulintel.es at lists.cluenet.de> en nombre de Erik Nygren <erik at nygren.org>
Responder a: <erik at nygren.org>
Fecha: sábado, 30 de abril de 2016, 17:33
Para: Jordi Palet Martinez <jordi.palet at consulintel.es>
CC: IPv6 operators forum <ipv6-ops at lists.cluenet.de>
Asunto: Re: push apps failing in Android until you disable IPv6

>At least on some Samsung devices there is this known issue where they drop IPv6 packets when screen-saved.
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>This is fixed n the Galaxy S7 apparently (I haven't tested myself).  I agree this is a major problem...
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>http://developer.samsung.com/forum/board/thread/view.do?boardName=General&messageId=239890
>http://www.gossamer-threads.com/lists/nsp/ipv6/54641
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>On Sat, Apr 30, 2016 at 8:03 AM, JORDI PALET MARTINEZ <jordi.palet at consulintel.es> wrote:
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>Hi,
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>I’m not an Android user, but while doing and IPv6 training, many folks in the meeting room told me that they needed to disable IPv6 in the router/Android devices, otherwise they aren’t getting the notifications from WhatsApp, Facebook, and many other apps.
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>We have tried disabling energy saving options in Android, and it seems the problems is not there. Basically, if the Android device is in stand-by, notifications don’t come, until you “open” the Android. Apple and Windows devices don’t have this problem.
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>The scenario seems to happen regardless of the type of CPE (some observed this with ADSL, others with GPON).
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>Just for having a “stable scenario” were to try, we have actually replicated this problem with Android 4.4 and 5.1, with an ONT Huawei HG8245H, hw v 494.B and firmware v V3R013C00S106.
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>We have tried using both the ONT as the wireless AP and also disabling the WiFi on the ONT and using an external AP. Same problem in both situations.
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>Don’t look like an issue related to a specific ISP, because the situation happens in many different ISPs, and of course none of them provides IPv6 :-(
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>I’m specially worried because the ISPs are telling the users to disable IPv6 everywhere …
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>Any hints ?
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>Regards,
>Jordi
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