Microsoft Adds CLAT Support to Windows 11 to Facilitate IPv6 Transition
Microsoft has integrated Customer-side Translator (CLAT) functionality into Windows 11, allowing IPv4-dependent applications to function on pure IPv6 networks.
Microsoft announced the deployment of the Customer-side Translator (CLAT) feature for Windows 11 version 25H2 and later. The update is designed to maintain compatibility for older software that requires IPv4 addresses as telecommunications infrastructure shifts toward a pure IPv6 standard.
The feature operates as part of the 464XLAT architecture, acting as an intermediary that translates IPv4 traffic into IPv6 format. This traffic is then routed through a network-side NAT64/PLAT service to reach its destination. The system is designed to trigger automatically via router announcements or DNS queries, minimizing the need for manual configuration by the end-user.
For enterprise environments, the implementation aims to lower the barrier for network upgrades. It allows organizations to transition to IPv6-only environments without requiring the immediate refactoring of all legacy applications, potentially reducing the operational costs associated with maintaining dual-stack networks or sourcing dwindling IPv4 address space.