diff --git a/p4app/controller.py b/p4app/controller.py
index 60d934f..bea6fd3 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -250,8 +250,15 @@ class L2Controller(object):
 
         answer = e / i / i2 / i3
 
+        # try 4
+        for l in [Ether, IPv6, ICMPv6ND_NA, ICMPv6NDOptDstLLAddr]:
+            try:
+                del answer[l].chksum
+            except AttributeError:
+                pass
+
         # Let scapy recalc checksum (try3)
-        answer = answer.__class__(str(answer))
+        # answer = answer.__class__(str(answer))
 
         self.send_pkg(answer)