diff --git a/doc/plan.org b/doc/plan.org
index 0d6aff6..2532d9b 100644
--- a/doc/plan.org
+++ b/doc/plan.org
@@ -61,6 +61,11 @@
 |            | - send back to switch                                                      |       |
 |            | - test with host                                                           |       |
 |            |                                                                            |       |
+| 2019-03-06 | Meet Laurent #3                                                            |       |
+|            | - Checksum's in scapy                                                      |       |
+|            | - Python2 ipaddress fix (import future)                                    |       |
+|            | - P4 checksum_with_payload                                                 |       |
+|            |                                                                            |       |
 |            |                                                                            |       |
 | 2019-03-08 | NAT46 1:1 table ICMP, ICMPv6 working                                       |       |
 |            | Will need some switch local ip addresses                                   |       |
diff --git a/p4app/controller.py b/p4app/controller.py
index a5ac4f1..60d934f 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -248,10 +248,11 @@ class L2Controller(object):
         i2 = ICMPv6ND_NA(S=1, R=0, tgt=src_addr)
         i3 = ICMPv6NDOptDstLLAddr(lladdr=src_mac)
 
-        # Force scapy to recalculate ??
-        i.chksum = None
-
         answer = e / i / i2 / i3
+
+        # Let scapy recalc checksum (try3)
+        answer = answer.__class__(str(answer))
+
         self.send_pkg(answer)
 
     def send_pkg(self, pkg):
@@ -283,7 +284,6 @@ class L2Controller(object):
             elif cpu_header.task == self.task['ICMP6_GENERAL']:
                 log.info("Replying to ICMP packet")
 
-
         else:
             print("Broken pkg: {}".format(pkg.__repr__()))
             return