Disabling IPv6Unlike Windows XP, IPv6 in Windows Vista and Windows Server 2008 cannot be uninstalled. To disable IPv6 on a specific connection, you can do the following:
| • | In the Network Connections folder, obtain properties of the connection and clear the check box next to the Internet Protocol version 6 (TCP/IPv6) component in the list under This connection uses the following items. This method disables IPv6 on your LAN interfaces and connections, but does not disable IPv6 on tunnel interfaces or the IPv6 loopback interface.
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To selectively disable Pv6 components and configure behaviors for IPv6 in Windows Vista, create and configure the following registry value (DWORD type):
| • | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tcpip6\Parameters\DisabledComponents
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DisabledComponents is set to 0 by default.
The DisabledComponents registry value is a bit mask that controls the following series of flags, starting with the low order bit (Bit 0):
| • | Bit 0 Set to 1 to disable all IPv6 tunnel interfaces, including ISATAP, 6to4, and Teredo tunnels. Default value is 0.
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| • | Bit 1 Set to 1 to disable all 6to4-based interfaces. Default value is 0.
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| • | Bit 2 Set to 1 to disable all ISATAP-based interfaces. Default value is 0.
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| • | Bit 3 Set to 1 to disable all Teredo-based interfaces. Default value is 0.
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| • | Bit 4 Set to 1 to disable IPv6 over all non-tunnel interfaces, including LAN interfaces and Point-to-Point Protocol (PPP)-based interfaces. Default value is 0.
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| • | Bit 5 Set to 1 to modify the default prefix policy table to prefer IPv4 to IPv6 when attempting connections. Default value is 0. For more information about the prefix policy table, see Source and Destination Address Selection for IPv6, the February 2006 The Cable Guy article.
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To determine the value of DisabledComponents for a specific set of bits, construct a binary number consisting of the bits and their values in their correct position and convert the resulting number to hexadecimal. For example, if you want to disable 6to4 interfaces, disable Teredo interfaces, and prefer IPv4 to IPv6, you would construct the following binary number: 101010. When converted to hexadecimal, the value of DisabledComponents is 0x2A.
The following table lists some common configuration combinations and the corresponding value of DisabledComponents.
| Configuration combination | DisabledComponents value |
Disable all tunnel interfaces
| 0x1
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Disable 6to4
| 0x2
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Disable ISATAP
| 0x4
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Disable Teredo
| 0x8
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Disable Teredo and 6to4
| 0xA
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Disable all LAN and PPP interfaces
| 0x10
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Disable all LAN, PPP, and tunnel interfaces
| 0x11
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Prefer IPv4 over IPv6
| 0x20
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Disable IPv6 over all interfaces and prefer IPv4 to IPv6
| 0xFF
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You must restart the computer for the changes to the DisabledComponents registry value to take effect.
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