Disable Internet Protocol version 6 (IPv6) in Vista

How to disable certain Microsoft Internet Protocol version 6 (IPv6) components in Windows Vista. To disable IPv6 components, you must be logged on to the Windows Vista computer as a member of the Administrators group, or your user account must be granted permissions to edit the Windows registry.

To disable certain IPv6 components in Windows Vista, follow these steps:

• Click Start, type regedit in the Start Search box, and then click regedit.exe in the Programs list.

• In the User Account Control dialog box, click Continue.

• In Registry Editor, locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\

• Double-click DisabledComponents to modify the DisabledComponents entry.

Note:- If the DisabledComponents entry is unavailable, you must create it. To do this, follow these steps:

• In the Edit menu, point to New, and then click DWORD (32-bit) Value.

• Type DisabledComponents, and then press ENTER.

• Double-click DisabledComponents.

Type any one of the following values to configure the IPv6 protocol, and then click OK:

• Type 0 to enable all IPv6 components.

Note The value “0″ is the default setting.

• Type 0xffffffff to disable all IPv6 components, except the IPv6 loopback interface. This value also configures Windows Vista to use Internet Protocol version 4 (IPv4) instead of IPv6 in prefix policies.

• Type 0×20 to use IPv4 instead of IPv6 in prefix policies.

• Type 0×10 to disable native IPv6 interfaces.

• Type 0×01 to disable all tunnel IPv6 interfaces.

• Type 0×11 to disable all IPv6 interfaces except for the IPv6 loopback interface.

Now You must restart your computer for these changes to take affect.

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