diff --git a/hosts/physiques/cephiroth/networking.nix b/hosts/physiques/cephiroth/networking.nix
index 1dd7ea6..beb112a 100644
--- a/hosts/physiques/cephiroth/networking.nix
+++ b/hosts/physiques/cephiroth/networking.nix
@@ -45,6 +45,7 @@
         };
       };
       ceph = {
+        mtu = 9000;
         ipv4 = {
           addresses = [
             {
@@ -55,6 +56,7 @@
         };
       };
       adm = {
+        mtu = 9000;
         ipv4 = {
           addresses = [
             {
@@ -65,6 +67,7 @@
         };
       };
       san = {
+        mtu = 9000;
         ipv4 = {
           addresses = [
             {