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Created November 28, 2025 20:04
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README.md

Enable CLAT support in Windows 11

Works with x64 OS build 26220 (Preview build)

  • Option 108 needs to be accepted

HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DhcpIpv6OnlyPreferred => 1

  • CLAT is not enabled by default, you can check more of the settings in help and clat show global

netsh interface clat set global permit=enabled

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setup.cmd
:: Enable CLAT support in Windows 11
:: Works with x64 OS build 26220 (Preview build)
REG ADD HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters /v DhcpIpv6OnlyPreferred /t REG_DWORD /d 1 /f
netsh interface clat set global permit=enabled
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NiKiZe commented Jan 21, 2026

Microsoft can control which features are available with rollouts. Hopefully this will come back without hacks.
If you want to test this out you should probably sign up as a tester.

What I would do to try and figure out how to re-enable this is to run procmon while using netsh and see if any access to registry keys like below is seen.. but this is just a guess on how to maybe figure out how to re-enable.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FeatureManagement\Overrides\x\x
"EnabledState"=dword:00000001

@thomasschaeferm
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thomasschaeferm commented Jan 21, 2026

I haven't received some emails as tester. This is fixed. Now I am tester again, but not allowed to share the information. At the moment MS provides an additionally small exe to enable the features, of course with the same sharing restrictions.

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