Apologies for a non answer, but any app (at least with Apple) is required to 
support IPv6 only networks.

https://developer.apple.com/support/ipv6/

Rather than work on a 6 to 4 fix, why not put some energy into supporting IPv6?



**Regards, Troy**

Brevity is the elixir of life.


Father Hector McGrath, Pixie 2020






\-------- Original Message --------
On 4 Jan 2022, 9:03 pm, Matthew H < [email protected]> wrote:

>
>
>
> Hi,
>
>
>
> We are developing a WebRTC mobile app that sets up a media session via Web 
> Socket and then sends the media via RTP over UDP. It's working on most 
> networks but we've had users report issues with the app when their iPhone is 
> connected to the Telstra Mobile network.
>
>
>
> Unfortunately our network only supports IPv4, and after examining the 
> available logs it appears their iPhone only gets an IPv6 address. The Web 
> Socket communication is able to reach us so I assume a NAT64 gateway is in 
> use, but we don't see any RTP / UDP arrive at our network edge.
>
>
>
>
> We found a couple of posts that suggest users have had similar issues with 
> UDP being dropped:
>
> https://crowdsupport.telstra.com.au/t5/network-roaming/unable-to-stream-video-over-udp-on-ipv6-only-connection/td-p/933472
> https://crowdsupport.telstra.com.au/t5/network-roaming/ios-and-ipv6/td-p/931449
>
> https://crowdsupport.telstra.com.au/t5/apple-ios/nordvpn-won-t-connect-on-4g-ios/td-p/932511
>
>
>
>
> Is anyone aware of Telstra's NAT64 gateway dropping UDP?
>
>
>
> Thanks
>
> Matthew
>

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