diff --git a/machines/lisa/default.nix b/machines/lisa/default.nix
index 6fac31c..3558cad 100644
--- a/machines/lisa/default.nix
+++ b/machines/lisa/default.nix
@@ -71,9 +71,10 @@
 
   networking.hostName = "lisa";
   networking.interfaces.ens20.useDHCP = false;
+  networking.interfaces.ens20.mtu = 1420;
   networking.interfaces.ens20.ipv4.addresses = [{ address = "212.129.40.11"; prefixLength = 32; }];
   networking.localCommands = ''
-    ip r del default || ip r add default dev ens20
+    ip r del default || ip r add default dev ens20 || ip link set dev ens20 mtu 1420 
   '';
   networking.interfaces.ens18.useDHCP = true;
   networking.interfaces.ens19.useDHCP = false;