I just wanted to share my experience with you, in case you should happen to have bought a Homebox subscription with the danish ISP TDC. In their greed (yeah, I call it greed..), they came up with this superb idea: Why not make the customers pay for IPv6 access, and to be sure it works, block all other free IPv6 access. If you have a Homebox, and are a private customer, then the only tunnel setup that is working is UDP (AYIYA), because they are blocking protocol 41 in the homebox routers by defaut. I have spent hours with TDC support to get a solution, and the only one is this: The only way to get them to route p.41 through, is to register as a company, but then (in denmark) you need to be registered with a CVR nummer, and that's a whole new story.. At the same time, they are advertising native IPv6 to their customers, but only to companies, not to private. And you have to pay for it. This is the first ISP aiming to get profit from IPv6, but I'm sure it is'nt the last one.