Enable Windows CLAT: Run IPv4-only apps on IPv6-only networks

Windows CLAT (customer-side translator) reached general availability in Windows 11 25H2, beginning with build 26200.9550. On IPv6-only and IPv6-mostly networks, it keeps IPv4-only applications working by translating their IPv4 traffic to IPv6 on the client. It implements the client side of the 464XLAT design and requires a NAT64 gateway on the network. Below we cover how CLAT behaves, what the network must provide, how to turn it on with netsh and Group Policy, and where the feature still falls short. Source

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