Thursday, August 11, 2011

Tunnel Adapters in Windows 7

Have you ever noticed the ton of tunnel adapters that get created on Windows 7?

What really are these tunnel adapters?

From Microsoft - http://technet.microsoft.com/en-us/network/cc987595.aspx

Q. Why do I have an "Automatic Tunneling Pseudo-Interface" interface?

A. IPv6 in Windows XP and Windows Server 2003 uses the "Automatic Tunneling Pseudo-Interface" for encapsulating IPv6 packets with an IPv4 header so that they can be sent across an IPv4 network. By default, IPv6 configures a link-local Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) address on the Automatic Tunneling Pseudo-Interface. The link-local ISATAP address has the form fe80::200:5efe:w.x.y.x or fe80::5efe:w.x.y.x, in which w.x.y.x is an IPv4 address assigned to the computer.


So what if you are not using IPv6 and want to get rid of these?

After some looking around - I stumbled across this post -

http://social.technet.microsoft.com/Forums/en-US/itprovistanetworking/thread/32b0c129-fa2d-431a-a275-4288c729605a

short answer is - disable the tunnel adapters using the command:

netsh int isa set state disabled

You may also notice a 6to4 adapter.
You can disable it using the command -

netsh int 6to4 set state disabled

and you are done....


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