diff --git a/p4app/controller.py b/p4app/controller.py
index 784fe7b..9b69fad 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -248,8 +248,16 @@ class L2Controller(object):
 
             ether_part.type = cpu_header.type
 
+            bits = 0
+            for field in CpuHeader.fields_desc:
+                bits += field.sz
+
+            shift_by = (bits/8) -1
+
+            log.debug("Len of cpu= {}, {}, shift={}".format(bits, bits/8, shift_by)
+
             ether_orig = Ether(src=packet.src, dst=packet.dst, type=0x86dd)
-            orig_packet = ether_orig / IPv6(packet.load[6:])
+            orig_packet = ether_orig / IPv6(packet.load[shift_by:])
             log.debug("o={}".format(orig_packet.__repr__()))