NAT external interface*s*

Help
1

Hi, I’m setting up NAT rules so my nixos-container can access the public internet, and the following works mostly:

nat = {
  enable = true;
  internalInterfaces = [
    "ve-+" # nixos-containers
  ];
  externalInterface = "wlp3s0";
};

However, if I connect my laptop to the internet via a cable, the externalInterface name should be “enp2s0” instead. How do I configure this? It is not an acceptable solution to have to change the config and rebuild every time I plug the laptop in or unplug it again!

kind regards