configuration.nix/hosts/shared/network.nix

{ lib, ... }: {
  networking = {
    nameservers = [
      "10.10.10.10"
    ];
    useDHCP = lib.mkDefault false;
  };

  services.resolved = {
    enable = true;
    dnssec = "true";
    fallbackDns = [ ];
  };
}