diff --git a/lib/xl2tpd.sh b/lib/xl2tpd.sh
index 18de7d3..0f5d6be 100755
--- a/lib/xl2tpd.sh
+++ b/lib/xl2tpd.sh
@@ -92,6 +92,7 @@ linkname $LAC_NAME
 logfile $PPP_LOG_FILE
 name $USERNAME
 password $PASSWORD
+mtu 1428
 EOF
     chmod 600 $PPP_OPT_FILE