Hello,
Thank you for contacting Teltonika Crowd support.
IPV6 is implemented in the latest firmware of RUT955. And in this case note that the latest firmware is RUT9_R_00.07.02.4 | 2022.07.20
You can set IPV6 settings by going to Network > Interfaces from this window you can see WAN6 interfaces.
You can also set the mobile interfaces to use IPV6. Use the pencil like edit feature to change this configuration.
NAT64 is yet to be implemented fully.
For more technical support and clarification, kindly revert.
Kind regards,
Shadrack.