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Q: 

Why do we need libnet_do_checksum? HTTP checksum doesnt work

I understood that the tcp checksum calculates automaticly if we write 0 in the function libnet_build_tcp, so why do we need libnet_do_checksum?

I have an error, when I am trying to build a new packet. A regulat TCP packet(SYN,ACK) works fine, but an HTTP packet don't work, beacuse a tcp checksum error. Do I have to use libnet_do_checksum?

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