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Vadim Smirnov

How can I do the same ?

Packet data follow the packet header.

If I change the data and recalculate the chksum; what special care does the code have to take ?

If you don’t modify packet length then checksums (IP/TCP/UDP) recalculation is enough. If you do modify packet length (an example change “sex” to “fofo”) for TCP protocol you also have to care about Sequence and Acknowledgement numbers.