diff --git a/hosts/geon/configuration.nix b/hosts/geon/configuration.nix
index b955739..63ed4c3 100644
--- a/hosts/geon/configuration.nix
+++ b/hosts/geon/configuration.nix
@@ -21,6 +21,7 @@
   networking.hostName = "geon";
   networking.useDHCP = false;
   networking.interfaces.ens18.useDHCP = true;
+  networking.interfaces.ens18.mtu = 1420;
   networking.interfaces.ens18.ipv6.addresses = [{
     address = "2a01:4f8:c010:61dc:200::500:1";
     prefixLength = 72;
diff --git a/hosts/kaon/configuration.nix b/hosts/kaon/configuration.nix
index c4ac8cf..fb60a54 100644
--- a/hosts/kaon/configuration.nix
+++ b/hosts/kaon/configuration.nix
@@ -21,6 +21,7 @@
   networking.hostName = "kaon";
   networking.useDHCP = false;
   networking.interfaces.ens18.useDHCP = true;
+  networking.interfaces.ens18.mtu = 1420;
   networking.interfaces.ens18.ipv6.addresses = [{
     address = "2a01:4f8:c010:61dc:200::42:1";
     prefixLength = 72;
diff --git a/hosts/nebula/configuration.nix b/hosts/nebula/configuration.nix
index 3937506..58afc21 100644
--- a/hosts/nebula/configuration.nix
+++ b/hosts/nebula/configuration.nix
@@ -18,6 +18,7 @@
 
   networking.useDHCP = false;
   networking.interfaces.ens18.useDHCP = true;
+  networking.interfaces.ens18.mtu = 1420;
   networking.interfaces.ens18.ipv6.addresses = [{
     address = "2a01:4f8:c010:61dc:200::500:2";
     prefixLength = 72;