Finding out the advertised NAT64 prefix on an end device.

[YSLew-tado]

Hi,

My end device displays a NAT64 prefix with netdata show. It is able to reach the public internet when the destination IPv6 address is appended to the prefix.
I was wondering if there is an OT API to find out the advertised NAT64 prefix so that I can utilise it in the firmware instead of CLI.

Thanks

[jwhui]

NAT64 prefixes configured on the Thread network are published in Thread network data. Note that there may be one or more NAT64 prefixes configured.

Use otNetDataGetNextRoute() to iterate through the routes published in Thread network data. The otExternalRouteConfig structure indicates whether the route is a NAT64 prefix.

The CLI implementation of netdata show provides an example of how to use these APIs: https://github.com/openthread/openthread/blob/main/src/cli/cli_network_data.cpp#L503

[YSLew-tado]

That helped.

Thanks for pointing me to the right place!

[Zepperoni]

@YSLew-tado Also trying to figure out the NAT64 prefix. Could you provide me with an example

[jwhui]

The otNat64SynthesizeIp6Address() API will synthesize an IPv6 address from an IPv4 address using the advertised NAT64 prefix.

[Zepperoni]

Perfect, that helped me.
Thanks