Nix is a pain. Not everything works. Example Netword supposed to be able to put options in some confines. Sure most work but I have two in my config that nix well not put in. Why they are valid an I’m running them on my current Os but my nix van refuses to build with them. Another nftsble rules. Again supposed to put them in config file. But I have some nix does not like, completely valid rules but nix won’t build with them. I’ll tinker with it but it still needs work.