diff --git a/modules/misc/deployment.nix b/modules/misc/deployment.nix
index 373a1a0fbd80..b9be81ebf578 100644
--- a/modules/misc/deployment.nix
+++ b/modules/misc/deployment.nix
@@ -146,6 +146,28 @@ let cfg = config.deployment; in
       '';
     };
 
+    # Computed options useful for referring to other machines in
+    # network specifications.
+
+    networking.privateIPv4 = mkOption {
+      example = "10.1.2.3";
+      type = types.uniq types.string;
+      description = ''
+        IPv4 address of this machine within in the logical network.
+        This address can be used by other machines in the logical
+        network to reach this machine.  However, it need not be
+        visible to the outside (i.e., publicly routable).
+      '';
+    };
+
+    networking.publicIPv4 = mkOption {
+      example = "198.51.100.123";
+      type = types.uniq types.string;
+      description = ''
+        Publicly routable IPv4 address of this machine.
+      '';
+    };
+
   };
 
 
@@ -163,7 +185,6 @@ let cfg = config.deployment; in
         # throw "I don't know an AMI for zone ‘${cfg.ec2.zone}’ and platform type ‘${config.nixpkgs.system}’"
         "");
         
-      
     };
         
   };