err1.nix

    interfaces.enp4s0.ip4.addresses = [{
      address      = "192.168.0.200"; 
      prefixLength = 24;
    }];
    

network.nix

  networking = { 
    hostName = "quasar-nixos-tr"; 
    wireless = { enable = false; }; 
    networkmanager = { enable = true; }; 
    
    extraHosts = ''
    192.168.0.145 home-server 
    127.0.0.1 quasar.localhost
    127.0.0.1 linkerd.service
    127.0.0.1 redis.service
    '';
    
    interfaces.enp4s0.ip4 = [{
      address = "192.168.0.200"; 
      prefixLength = 24;
    }];
    
    defaultGateway = "192.168.0.1";
    nameservers = [ "8.8.8.8" "8.8.4.4" ];

  };