[AusNOG] Telstra Mobile NAT64 Gateway dropping UDP?

[Matthew H]

Hi,

The app works fine on other IPv6 only networks with NAT64 in place which
appears to satisfy Apple's requirements.

We are looking into adding proxies with IPv6 support, however it's likely
to take some time and it would be good if we can find a fix / workaround in
the meantime

Thanks

On Tue, Jan 4, 2022 at 10:10 AM Troy <troy at troykelly.com> wrote:

> 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 < Matthew at marrold.co.uk> 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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