Ядро:
  options         INET6           # IPv6 communications protocols
  pseudo-device   gif             # IPv6 and IPv4 tunneling
  pseudo-device   faith   1       # IPv6-to-IPv4 relaying (translation)

Регистрация и получение IP (http://www.freenet6.net или http://www.tunnelbroker.net)
  cd /usr/ports/net/freenet6/
  # make install clean
  # /usr/local/etc/rc.d/freenet6.sh start

Подъем IPv6 вручную
  ifconfig gif0 create
  ifconfig gif0 tunnel your-local-ipv4  remote-ipv4-of-your-broker
  ifconfig gif0 inet6  ipv6-given-by-the-broker ipv6-of-your-broker   prefixlen 128
  route -n add -inet6 default ipv6-of-your-broker

/etc/rc.conf:
  ipv6_enable="YES"
  ipv6_defaultrouter="brokeripv6"
  ipv6_gateway_enable="YES"
  ipv6_network_interfaces="de0 gif0"
  ipv6_ifconfig_gif0="brokeripv6 prefixlen 128"
  ipv6_ifconfig_de0="youripv6::1 prefixlen 64"
  ipv6_static_routes="global"
  ipv6_route_global="2000:: -prefixlen 3 youripv6"
  gif_interfaces="gif0"
  gifconfig_gif0="youripv4 brokeripv4"

Фаервол (Ipfilter):
  /etc/ipf6.rules
     pass in all
     pass out all
  ipf -6 -f /etc/ipf6.rules

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Обсуждается: https://www.opennet.ru/tips/info/659.shtml