The Hurricane Electric IPv6 Tunnel Broker allows you to reach the IPv6 Internet by tunnelling over your existing IPv4 connection through one of their IPv6 routers. To use their service, your Ubuntu system has to be IPv6 capable. Unless you haven’t manually disabled IPv6, it should be ready to use. Make sure with: $ sudo lsmod | grep ipv6
Now, you’ll need to setup the IPv6overIPv4 tunnel.read more.