--- openflow-2012-02-17.h	2015-07-23 09:54:16.900479352 -0700
+++ openflow-2012-01-19.h	2015-07-23 09:54:16.904479352 -0700
@@ -300,7 +300,8 @@
     uint32_t n_buffers;     /* Max packets buffered at once. */
 
     uint8_t n_tables;       /* Number of tables supported by datapath. */
-    uint8_t pad[3];         /* Align to 64-bits. */
+    uint8_t auxiliary_id;   /* Identify auxiliary connections */
+    uint8_t pad[2];         /* Align to 64-bits. */
 
     /* Features. */
     uint32_t capabilities;  /* Bitmap of support "ofp_capabilities". */