How to use NPTv6? FreeBSD Handbook have not mentioned about it.

From: batch <cnbatch_at_gmail.com>
Date: Fri, 12 May 2023 09:49:53 UTC
Dear All,

I would like to use NPTv6 on FreeBSD 13.2, this is my configuration:

https://forums.freebsd.org/threads/how-to-properly-configure-nptv6.88971/

It's now working. Can anyone help to correct my configuration?

And if the configuration details can be written in the FreeBSD Handbook,
that would be great.

Thanks in advance!