Setting up an IPv6 tunnel via a tunnel broker

First sign up for your tunnel at http://www.tunnelbroker.net or an equivalent service.

This will get you some information that looks like this:
Server IPv4 address: 216.66.80.26
Server IPv6 address: 2001:470:1111:11::1/64
Client IPv4 address: 222.222.222.222
Client IPv6 address: 2001:470:1111:11::2/64
Assigned /64: 2001:470:3333:33::/64

Setup the 6to4 interface

/interface 6to4 add mtu=1280 name=sixbone local-address=222.222.222.222


Add your client IPv6 address to the new interface

/ipv6 address add address=2001:470:1111:11::2/64 interface=sixbone


Add a default IPv6 route via your tunnel

/ipv6 route add dst-address=2000::/3 gateway=::216.66.80.26


You can now add your assigned IPv6 addresses as required.