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I think that the Identification holds that answer, with a sequential number being sent on every packet, allowing the sender to know whether each packet is received or not because of ACK’s from each packet, or something like that.
Read this PDF file…it will step you through understanding IP Packet Fragmentation…why packets are fragmented (which I’m sure you already know) and give the exact parameters that need to be set in the newly created fragment packets in order for them to be reassebled at the target destination host.