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would be interested to know what people think is good about tunnels as an IPv6 transition technology, and what people think is bad about tunnels. The good thing about tunnels is people can build them where there's no proper network

The bad thing about tunnels is people build them instead of a proper network

brandon

We've used an HE tunnel with BGP for about a year and it has not been reliable enough for my tastes. However, I think it's great for testing - I just wouldn't want to rely on it for production. One, it's not ideal to force traffic over a tunnel that incurs additional processing, latency, and reliability problems. Second, in the case of a free HE tunnel, it might be viewed as impolite to send the tunnel provider lots of data (I don't remember seeing a bandwidth usage policy). Only in the case where local peers refuse to provide reliable IP6 transit would I consider using a tunnel full time for IP6 traffic. And even then, probably only if I was paying and had some sort of service guarantees and support from the tunnel provider. I would look at switching local peers for transit before relying on a tunnel. --Blake