networking.resolvconf.dnsExtensionMechanism
NixOS option
Enable the edns0 option in resolv.conf. With that option set, glibc supports use of the extension mechanisms for DNS (EDNS) specified in RFC 2671. The most popular user of that feature is DNSSEC, which does not work without it.
type: booleanDefault
declared in: nixos/modules/config/resolvconf.nixView source on NixOS/nixpkgs →true