++ unchecked checksums

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