What is ISATAP?
Both Teredo and ISATAP are mechanisms for IPv6 connectivity on IPv4-only networks. Since Windows 7 comes with IPv6 enabled, I wouldn't be surprised if they were always on, just didn't appear in ipconfig for some strange reason. (On one of my test VMs, the ISATAP adapter shows up, … windows 7 - How to remove unwanted tunnel adapter So what is tunnel adapter? Tunneling is how to do secure communications across an untrusted network such as the internet. If you look at "description" of each connection, via ipconfig /all, it will probably the contain either ISATAP or 6over4. Find information about Tunnel Adapters at Wikipedia. Tunnel adapter isatap giving media disconnected Jun 12, 2010
ISATAP Recommendations for DirectAccess Deployments
I have a router with the ususal 192 address. Normally I'd see two adapters in ipconfig /all: ethernet and wireless. Recently I noticed presence of something really odd - 2 Tunneling things. IPv6 ISATAP Configuration Example - Cisco Community
Tunnel Adapter Media disconnected. SOLVED!! - YouTube
Windows 7 tunnel adapter issue - YouTube Nov 12, 2010 Notes on setting up ISATAP « rakhesh.com