diff --git a/group_vars/fleming/main.yml b/group_vars/fleming/main.yml
index c01bc59..94f9cc8 100644
--- a/group_vars/fleming/main.yml
+++ b/group_vars/fleming/main.yml
@@ -3,3 +3,5 @@ apartment_block: fleming
 apartment_block_id: 1
 
 router_ip_suffix: 254
+
+mtu: 1500