Last week I installed Miredo and configured my system to handle IPv6 through 6to4 tunneling. It was easy and it worked well.

So I decided I'd give Hurricane Electric's IPv6 connection a try. I've had a lot to learn, and I thought I had it all running (with a great deal of help from a very patient person at Hurricane: my LinkSys E3200 didn't like IPv6).

But now, when all should be good, after I uninstalled Miredo and Teredo and whatever else, I find that there is "6to4 tunneling - another automatic tunneling," which I need to remove from my box. But I have no idea where or what it might be.

Connected to my computer are a couple printers, an external hard drive, and a router (which has no settings for IPv6). All of these are, I think, innocent in this matter.

So, how can I get rid of 6to4 tunneling, when I don't even know where it is? Is there someplace to look and find out what's going on? I'm pretty new to Linux and Ubuntu.