And you explain in previously email. We are understand. But we are try simulate test on netscaler by give with the ip on netscaler open connection to origin instead source IP client. Which we found the netscaler did re new fragment itself and ACK to origin. I’m not understand why the netscaler re new fragment by not receive ICMPv6. But we believe the issue occurred ICMPv6 to big direct to source IP (Client) which really that should be send to Netscaler