parsons: add nftables

hosts/parsons/configuration.nix

@@ -5,6 +5,7 @@
     ../../common
     ./hardware.nix
     modules.encboot
+    modules.network.nftables modules.nftnat
     ((import sources.nix-hexchen) {}).profiles.nopersist
   ];
 
@@ -21,6 +22,10 @@
 
   networking.hostId = "b2867696";
   networking.useDHCP = true;
+  networking.nftables.enable = true;
+  hexchen.nftables.nat.enable = true;
+  networking.nat.internalInterfaces = ["ve-+"];
+  networking.nat.externalInterface = "enp35s0";
 
   system.stateVersion = "21.05";
 }