How To Disable Teredo IPv6 Tunneling in Microsoft Windows

Greg Ferro’s post about how Microsoft Teredo is a suboptimal networking solution made me think it’s time to update my old post on how to disable Teredo in Windows 7 and in Windows 8. For the record, I agree — I’ve had serious problems with it conflicting with my native IPv6 connectivity. 1. Open a command prompt with administrator privileges (Start->Accessories->right click on Command Prompt, choose Run as Administrator): 2. Issue the command: netsh interface teredo set state disabled 3. You may need to reboot, depending on your version of Windows. If you wish to re-enable Teredo at some point you can issue the command: netsh interface teredo set state type=default  

Tell Your Purchasing People: IPv6, VMware

In the world of system administration there aren’t too many things that are black & white. Everything is a shade of gray where admins solve their own problems however they need to, bending to the local desires & needs of their users or management. Everybody is right, nobody is wrong. I’ve come to realize that, and it’s no big deal. I am convinced, however, that if your organization does not have “fully implemented IPv6 support” and “full support under VMware virtual infrastructure” as requirements for purchasing any new hardware, software, or services, you’re doing it wrong[1][2]. Let’s assume that anything you’re buying now will last 5+ years. In 5+ years we will be out of IPv4 address space[3]. And it …

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…now with 100% more IPv6

The web server I run this blog’s virtual host from has been IPv6-enabled for about three years. On Monday night I asked myself why I’d never given the blog an AAAA record. So I did. I just looked at the logs, out of curiosity, to see how many of my readers are IPv6-enabled. It’s painful. Discounting myself, 19 unique visitors out of 1683, 1.13%, came in via IPv6. If you aren’t thinking about IPv6 you should start. Enabling IPv6 really isn’t a big problem, by itself, as most ISPs can handle requests like that now. If you’re anything like me the problems that will vex you are the little ones: death by a thousand paper cuts. It’ll be the fact …

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