Does anyone know why when using systemd without setting any networks "I want to control these with my own .link and .network files" I end up with a 40-lan1.network and a 40-wan1.network. I can not find any definitions for these in my config files and they are sym links to /etc/static/systemd/network/.

Here is my networking config

  systemd = {
    network = {
      enable = true;
      wait-online.timeout = 2;
      networks."99-ethernet-default-dhcp".enable = lib.mkForce false;
      networks."99-wireless-client-dhcp".enable = lib.mkForce false;
    };
    services."systemd-networkd-wait-online".enable = lib.mkDefault false;
  };

I can't even figure out how it chose the names lan1 and wan1

looks like I needed to do something like sudo nixos-rebuild --flake "git+file:///etc/nixos/#<system_name>" repl
and it appears it is in there somewhere.

nix-repl> builtins.attrNames config.networking.interfaces
[
  "lan1"
  "wan1"
]