This section involves installing FreeBSD 11.2 and configuring it for dual stack (IPv4 + IPv6) networking. If you already have an installed FreeBSD 11.2, the information needed to enable IPv6 is included in this writeup.
Note that if you are working with a FreeBSD prior to 9.0, the IPv6 configuration is very different – search online for details.
Click on the following link to download the procedure in PDF.