diff --git a/machines/nixos/vault01/networking.nix b/machines/nixos/vault01/networking.nix
index c04f8f7..bf72684 100644
--- a/machines/nixos/vault01/networking.nix
+++ b/machines/nixos/vault01/networking.nix
@@ -100,13 +100,16 @@ let
       Id = 223;
       address = with uplink; [ "${ip}/${builtins.toString prefix}" ];
 
-      extraNetwork.routes = [
-        {
-          # Get the public ip from the metadata
-          PreferredSource = builtins.head meta.network.${name}.addresses.ipv4;
-          Gateway = uplink.router;
-        }
-      ];
+      extraNetwork = {
+        routes = [
+          {
+            # Get the public ip from the metadata
+            PreferredSource = builtins.head meta.network.${name}.addresses.ipv4;
+            Gateway = uplink.router;
+          }
+        ];
+        linkConfig.MTUBytes = 1500;
+      };
     };
 
     vlan-admin = {
@@ -130,7 +133,10 @@ let
       Id = 2000;
       address = [ "10.0.255.1/24" ];
 
-      extraNetwork.networkConfig.DHCPServer = "yes";
+      extraNetwork = {
+        networkConfig.DHCPServer = "yes";
+        linkConfig.MTUBytes = 1500;
+      };
     };
 
     vlan-hypervisor = {
@@ -195,6 +201,7 @@ in
             IPv6AcceptRA = false;
             IPv6SendRA = false;
           };
+          linkConfig.MTUBytes = 1504;
         };
         "50-br0" = {
           name = "br0";
@@ -207,7 +214,7 @@ in
             IPv6AcceptRA = false;
             IPv6SendRA = false;
           };
-          linkConfig.MTUBytes = 1500;
+          linkConfig.MTUBytes = 1504;
         };
         "50-wg0" = {
           name = "wg0";