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Disabling IPv6 or running IPv6/IPv4

If you’re running Windows Vista and Windows Server 2008 with DHCP, you’ll be likely to encounter problems if you don’t set up IPv6 properly. The fix is of course to set up IPv6 properly on the server, but there are a few workarounds if you can’t do that. You can’t uninstall IPv6, but you can, among others disable it, or configure it at will.
To disable it, clear the Internet Protocol version 6 (TCP/IPv6) check box in the properties of a network connection. You can also configure it a bit more than that. What you need to do is create a registry key and set it properly. Here’s how:

  1. Open the “run” dialog box, enter regedit, and click ok
  2. Create the following key: HKLM\SYSTEM\CurrentControlSet\Services\tcpip6\Parameters\DisabledComponents
  3. Set the value of the key in accordance with the following table
Configuration combination DisabledComponents
Disable all tunnel interfaces 0x1
Disable all LAN and PPP interfaces 0x10
Disable all LAN, PPP and tunnel interfaces 0x11
Use IPv4 in preference to IPv6 0x20
Disable IPv6 over all interfaces, and use IPv4 in preference to IPv6 0xFF

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