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Fedora 45 will enable IPv6-mostly support in NetworkManager by default. IPv6-mostly is a networking approach that primarily uses IPv6 while retaining IPv4 connectivity for legacy devices via DHCPv4 option 108 and 464XLAT CLAT. This incremental step sits between full dual-stack and IPv6-only, reducing IPv4 address consumption without breaking legacy device support. The Fedora Engineering and Steering Committee approved this change for the Fedora 45 release later in 2026.

Fedora 45 Aims For IPv6-Mostly Support Out-Of-The-Box