To install Miredo for access to the IPv6 world:
sudo apt-get install miredo
Remove Miredo system startup links, if you wish:
sudo update-rc.d -f miredo remove
You may have to Edit Miredo's config file:
sudo vi /etc/miredo.conf
#Comment out any other entry and paste:
ServerAddress teredo.ipv6.microsoft.com
Save and Restart Miredo.
Miredo Usage:
sudo /etc/init.d/miredo start
sudo /etc/init.d/miredo stop
sudo /etc/init.d/miredo restart
sudo /etc/init.d/miredo reload
sudo /etc/init.d/miredo force-reload
Check your current status by going HERE
(UFW)
sudo ufw disable
sudo gedit /etc/default/ufw (IPv6=no to IPv6=yes)
sudo ufw enable
sudo ufw status
Source