Microsoft KB Archive/828689

= You Lose IPv6 Connectivity After You Use a Video Capture Device =

Article ID: 828689

Article Last Modified on 2/21/2007

-

APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Media Center Edition 2002
 * Microsoft Windows XP Tablet PC Edition

-





SYMPTOMS
After you install or use a video capture device (such as a TV tuner or a USB Webcam), you may lose Internet Protocol version 6 (IPv6) connectivity until you restart your computer.



CAUSE
This problem may occur if the TV Data Adapter is automatically configured with a public Internet Protocol version 4 (IPv4) address if your computer is behind a Network Address Translation (NAT) device. With this configuration, the IPv6 networking stack in Windows XP tries to use the 6to4 automatic tunneling technology instead of Teredo with your NAT device. If your NAT device does not support 6to4, you lose IPv6 connectivity.



WORKAROUND
To work around this problem, temporarily disable 6to4.

Note After you restart your computer or remove the video capture device, you must enable 6to4 again.

To disable 6to4, follow these steps:  Click Start, click Run, and then type:

cmd

 Click OK. At the command prompt, type:

netsh interface ipv6 6to4 set state disabled

 Press the ENTER key.

To enable 6to4, follow these steps:  Click Start, click Run, and then type:

cmd

</li> Click OK.</li> At the command prompt, type:

netsh interface ipv6 6to4 set state default

</li> Press the ENTER key.</li></ol>

<div class="status_section">

STATUS
Microsoft has confirmed that this is a problem in Windows XP.

<div class="moreinformation_section">

MORE INFORMATION
The updated IPv6 networking stack in the Advanced Networking Pack for Windows XP includes support for Network Address Translation (NAT) over IPv4 NAT devices by using 6to4 and Teredo. 6to4 and Teredo permit IPv6 traffic over an IPv4 NAT.

For additional information about the Advanced Networking Pack, click the following article number to view the article in the Microsoft Knowledge Base:

817778 Overview of the Advanced Networking Pack for Windows XP

Keywords: KB828689

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.