diff --git a/nixos/boxes/colony.nix b/nixos/boxes/colony.nix
index 2b5dcb8..13ae7c2 100644
--- a/nixos/boxes/colony.nix
+++ b/nixos/boxes/colony.nix
@@ -22,6 +22,8 @@
       {
         imports = [ "${modulesPath}/profiles/qemu-guest.nix" ];
 
+        networking.domain = "nl1.int.nul.ie";
+
         boot.kernelParams = [ "intel_iommu=on" ];
         boot.loader.systemd-boot.configurationLimit = 20;
         fileSystems = {
@@ -50,20 +52,24 @@
           pciutils
         ];
 
-        networking = {
-          interfaces = mkIf (!config.my.build.isDevVM) {
-            enp10s0.useDHCP = true;
-          };
-        };
-
         systemd = {
           network = {
+            links = {
+              "10-base-ext" = {
+                matchConfig.MACAddress = "52:54:00:81:bd:a1";
+                linkConfig.Name = "base-ext";
+              };
+            };
             netdevs."25-base".netdevConfig = {
               Name = "base";
               Kind = "bridge";
             };
             networks = {
               "80-base" = networkdAssignment "base" assignments.internal;
+              "80-base-ext" = {
+                matchConfig.Name = "base-ext";
+                networkConfig.Bridge = "base";
+              };
               "80-vm-tap" = {
                 matchConfig = {
                   # Don't think we have control over the name of the TAP from qemu-bridge-helper (or how to easily pick
diff --git a/nixos/default.nix b/nixos/default.nix
index 7e44e2e..6b5a31b 100644
--- a/nixos/default.nix
+++ b/nixos/default.nix
@@ -60,7 +60,7 @@ let
           };
 
           system.name = name;
-          networking.hostName = mkDefault name;
+          networking.hostName = mkDefault (config'.assignments.internal.name or name);
           nixpkgs = {
             inherit (config') system;
             # Make sure any previously set overlays (e.g. lib which will be inherited by home-manager down the
diff --git a/nixos/modules/network.nix b/nixos/modules/network.nix
index f86d3bc..dc238af 100644
--- a/nixos/modules/network.nix
+++ b/nixos/modules/network.nix
@@ -11,6 +11,8 @@ in
         enableIPv6 = mkDefault true;
         useNetworkd = mkDefault true;
       };
+
+      services.resolved.domains = [ config.networking.domain ];
     }
 
     (mkIf config.my.build.isDevVM {
diff --git a/nixos/vms/estuary.nix b/nixos/vms/estuary.nix
index 3cc88d5..48c7778 100644
--- a/nixos/vms/estuary.nix
+++ b/nixos/vms/estuary.nix
@@ -5,7 +5,7 @@
     home-manager = "unstable";
 
     assignments.internal = {
-      name = "estuary.vm";
+      name = "estuary-vm";
       altNames = [ "fw" ];
       ipv4 = {
         address = "10.100.0.1";
@@ -24,6 +24,8 @@
 
         config = mkMerge [
           {
+            networking.domain = "nl1.int.nul.ie";
+
             boot.kernelParams = [ "console=ttyS0,115200n8" ];
             fileSystems = {
               "/boot" = {