Note: This is part two of two; the first part was posted last week.
Last week, we took a look at how to make the transition from IPv4 to IPv6 using nothing but standard equipment you probably already own. This week, you can wrap up your project with the details below.
Building an IPv6 tunnel
Since your ISP almost definitely doesn't deliver IPv6 yet, you'll need to build a tunnel across the IPv4 Internet to someone who can gateway you onto the IPv6 Internet. In this case, I used Hurricane Electric's free IPv6 tunnel broker service. You'll need to sign up for an account (a fairly painless process) before you can create a new tunnel.
To do that, you'll need to know the outside interface IP of the router. If you create the tunnel from behind the firewall, the Create Tunnel dialog will tell you the originating IP. If not, you can run
show interfaces ethernet to see what IP your ISP has doled out.