diff --git a/defaults/main.yml b/defaults/main.yml
index 433dec1..4b809b7 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -26,3 +26,5 @@ strongswan_conn: []
 #     address: remote_address
 #     # further right-hand options here
 #   secret: abcde...z
+
+mtu: 0