diff --git a/config/etc/default/restconf.yaml b/config/etc/default/restconf.yaml
index 6d5a79fa..a6390373 100644
--- a/config/etc/default/restconf.yaml
+++ b/config/etc/default/restconf.yaml
@@ -61,6 +61,7 @@ redis:
   # used to specify the default data source for multiple data resourece
   defaultDataSourceName: "default"
 
+# upfHeaderLength: spare upf buffer, must destroy  
 mml:
   port: 4100
   sleep: 200
@@ -68,6 +69,7 @@ mml:
   password: admin
   mmlHome: ./mmlhome
   upload: /home/agtuser
+  upfHeaderLength: 2325
 
 # NE config
 ne: