Create virtual network interface to use with NAT

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1

I’m trying to to setup NAT tunelling on my NixOS server. My server has only one physical interface, which is pointed to the world. So I need to create a virtual network interface to define it as internal interface for NAT. My physical interface(let’s assume that it’s eth0) is defined as external interface.
So I’m wondering. how to create a virtual network interface in NixOS configs. I tried doing this way, but it didn’t gave any results:

nat0 = {
        ipv4.addresses = [
	  { address="10.10.10.3"; prefixLength=24; }
	];
      };
    };
  };
2

Found solution manually in network configuration module, at nixpkgs repo. You have to add virtual parsmeter to the configuration, like this:

nat0 = {
        virtual = true;
        ipv4.addresses = [
	  { address="10.10.10.3"; prefixLength=24; }
	];
      };
    };
  };
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