[outages] FYI: TMobile USA NAT64 is broken

[Javier Henderson]

> On Feb 3, 2016, at 7:00 PM, Mark Felder via Outages <outages at outages.org> wrote:
> 
> If you have an iPhone and have iOS 9.3 beta2 you receive carrier update
> 23.5.4 which makes your LTE IPv6-only. There are major issues with
> TMobile's existing NAT64 implementation. I suspect it is limited to UDP
> traffic, but I am limited from what I can test with my iPhone. Most TCP
> traffic seems to work, but it's impossible to do Facetime (audio or
> video) calls, etc. The push messages (TCP) are received by both ends,
> but the session never successfully connects and it times out.
> 
> Alternatively I've noticed it's impossible to connect to any Plex
> servers (TCP, port 32400).
> 
> All of this is resolved if you use a VPN, which is frustrating. I hope
> this is fixed before 9.3 rolls out to everyone.

TCP traffic is affected also. I can’t SSH to IPv4 addresses, for example.

The odd thing is that not all IPv4 traffic is affected. For example, I can browse to http://www.delta.com/ which appears to return only an IPv4 address (through a CDN).

-jav