iOS 10.3.1 breaks streaming over cellular?

[Michael McNamara]

I’ve seen this on T-Mobile, AT&T and have second hand reports of Verizon as well.  10.3.x only.  There’s no problem is iOS 10.2.x FWIW.  We did IPv6 testing when Apple first brought the issue to light and didn’t experience any issues.  However it would certainly seem as if IPv6 is in fact the issue here.

In glib (2.50-3), gresolver.c in gio makes use of inet_aton() which is called out in Apple's document as being problematic.  gresolver.c appears to primarily be used by various clock related classes — which may (or may not, I haven’t walked a stack trace) help explain why streaming is problematic.  This is the only place I immediately found that doesn’t make use of getaddrinfo().  gthreadedresolver.c and ginetsocketaddress.c make use of getaddrinfo() for example.  I wonder if swapping for inet_aton() for inet_pton() or implementing getaddrinfo() in gresolver.c might fix the issue.

Thanks for the reply!

> On Apr 26, 2017, at 7:30 AM, jml5qh <jml5qh at gmail.com> wrote:
> 
> What cell provider are you using for both iOS 10.2 and iOS 10.3.1? In iOS
> 10.2, T-Mobile turned on DNS64 support which breaks anything that passes an
> IPv4 string literal. For more information, here's a decent link on DNS64:
> https://developer.apple.com/library/content/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/UnderstandingandPreparingfortheIPv6Transition/UnderstandingandPreparingfortheIPv6Transition.html.
> 
> 
> 
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