push apps failing in Android until you disable IPv6

Tue May 10 12:45:42 CEST 2016

I think Push notifications are sent over a "Pull" connection (i.e. one
that's initiated by the android device to a central server). So if there is
some issue with creating outgoing connections in this scenario, that would
cause the problem you've seen.

On 10 May 2016 at 09:58, JORDI PALET MARTINEZ <jordi.palet at consulintel.es>
wrote:

> (Copied back to the list, as the list filtered the original message with
> the screen capture attachment)
>
> For the info of the list. This is what the rdisc6 provided:
>
> Hop Limit:              64 (0x40)
> Stateful address cons.: No
> Stateful other cons.:   Yes
> Router preference:      medium
> Router lifetime:        1800 (0x00000708) seconds
> Reachable time:         unspecified (0x00000000)
> Retransmit time:                unspecified (0x00000000)
>
>  MTU:                   1472 bytes (valid)
>  Source link-layer address:     2C:CF:58:E5:7C:C0
>  From fe80::1
>
> Right, but how this is affecting IPv4 push notifications ?
>
> My understanding is that the servers doing the “push”, as the WAN link has
> not got IPv6, are doing the push with IPv4.
>
> I could understand that Android may be slower to react to dual-stack
> traffic because there is a default route announced by the router with no
> GUA, but getting the push ?
>
> By the way, anyone got rdisc6 working in Mac OS X El Capitan ?
>
> Regards,
> Jordi
>
>
>
>
>
>
>
>
>
> -----Mensaje original-----
> De: Erik Kline <ek at google.com>
> Responder a: <ek at google.com>
> Fecha: martes, 10 de mayo de 2016, 4:41
> Para: Jordi Palet Martinez <jordi.palet at consulintel.es>
> CC: Lorenzo Colitti <lorenzo at google.com>
> Asunto: Re: push apps failing in Android until you disable IPv6
>
> >Uh...non-zero router lifetime means it's announcing a default route.
> >That seems unwise.
> >
> >On 10 May 2016 at 02:49, JORDI PALET MARTINEZ
> ><jordi.palet at consulintel.es> wrote:
> >> Just got a “screen” capture from one of those situations (rdisc6).
> >>
> >> Hopefully is useful ! They made it from a virtual machine in the same
> network as the Androids have the problema, having the VMware interfaces in
> bridge mode.
> >>
> >> Saludos,
> >> Jordi
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> -----Mensaje original-----
> >> De: <ipv6-ops-bounces+jordi.palet=consulintel.es at lists.cluenet.de> en
> nombre de Erik Kline <ek at google.com>
> >> Responder a: <ek at google.com>
> >> Fecha: lunes, 9 de mayo de 2016, 10:59
> >> Para: Jordi Palet Martinez <jordi.palet at consulintel.es>
> >> CC: IPv6 Ops list <ipv6-ops at lists.cluenet.de>, Lorenzo Colitti <
> lorenzo at google.com>
> >> Asunto: Re: push apps failing in Android until you disable IPv6
> >>
> >>>If this router were to send out an RA advertising itself as a default
> >>>router in this configuration that would probably cause the symptoms
> >>>you're seeing.  That's why I asked for a sample of any RAs seen on
> >>>such a network.  (Such a configuration would of course be broken,
> >>>effectively requiring Happy Eyeballs to function at all.)
> >>>
> >>>On 9 May 2016 at 17:52, JORDI PALET MARTINEZ <
> jordi.palet at consulintel.es> wrote:
> >>>> Hi Lorenzo,
> >>>>
> >>>> I don’t have an Android, so I can’t try myself, unfortunately, so I’m
> just replicating what several folks told me in a training (people from
> different ISPs, not just one).
> >>>>
> >>>> I’ve asked already a few days ago for more info, but still didn’t got
> it. I also asked to open a bug report as Erik suggested as well as the
> rdisc6 from the same LAN.
> >>>>
> >>>> Let me try to write it down again the issue:
> >>>>
> >>>> 1) ISP NOT providing IPv6, but CPE supports IPv6, which can be seen
> in the router configs and the routers has link local, and you can ping with
> link local to the router in the LAN. Clearly, router has not GUA.
> >>>>
> >>>> 2) iPhone working fine.
> >>>>
> >>>> 3) Android fails to receive IPv4 push from whatsapp, Facebook,
> others, when screen is off.
> >>>>
> >>>> 4) Disabling IPv6 in the router the problem disappears.
> >>>>
> >>>> 5) Complains to ISPs are responded with “disable IPv6 in the router”,
> is not useful at all :-(
> >>>>
> >>>> I can provide links to web pages from at least one “big” ISP, where
> they talk about this, but is in Spanish …
> >>>>
> >>>> I will ping right now again for more info and come back asap.
> >>>>
> >>>> Thanks !
> >>>>
> >>>> Regards,
> >>>> Jordi
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> -----Mensaje original-----
> >>>> De: <ipv6-ops-bounces+jordi.palet=consulintel.es at lists.cluenet.de>
> en nombre de Lorenzo Colitti <lorenzo at google.com>
> >>>> Responder a: <lorenzo at google.com>
> >>>> Fecha: lunes, 9 de mayo de 2016, 10:41
> >>>> Para: Jordi Palet Martinez <jordi.palet at consulintel.es>
> >>>> CC: IPv6 Ops list <ipv6-ops at lists.cluenet.de>
> >>>> Asunto: Re: push apps failing in Android until you disable IPv6
> >>>>
> >>>>>Jordi,
> >>>>>from your report it's not clear what the problem is. You say that the
> problem disappears when IPv6 is disabled on the router, but then you say
> that it also happens on an IPv4-only network. How can those statements both
> be true?
> >>>>>
> >>>>>It's not usually possible to disable IPv6 on an Android device unless
> the device is rooted, which usually involves installing a non-stock build
> which may behave differently.
> >>>>>
> >>>>>Also, please clarify what device you're talking about. Stock Android
> should not have this problem, but some OEMs are known to drop IPv6 packets
> when the screen is off.
> >>>>>
> >>>>>Cheers,
> >>>>>Lorenzo
> >>>>>
> >>>>>On Sat, Apr 30, 2016 at 9:03 PM, JORDI PALET MARTINEZ <
> jordi.palet at consulintel.es> wrote:
> >>>>>
> >>>>>Hi,
> >>>>>
> >>>>>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.
> >>>>>
> >>>>>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.
> >>>>>
> >>>>>The scenario seems to happen regardless of the type of CPE (some
> observed this with ADSL, others with GPON).
> >>>>>
> >>>>>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.
> >>>>>
> >>>>>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.
> >>>>>
> >>>>>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 :-(
> >>>>>
> >>>>>I’m specially worried because the ISPs are telling the users to
> disable IPv6 everywhere …
> >>>>>
> >>>>>Any hints ?
> >>>>>
> >>>>>Regards,
> >>>>>Jordi
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>>
> >
>
>
>
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