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Thats why my tcpheader started at position 400 in the packet, instead of position 20 :D. Thanks

Right, the kernel didn't change anything. It was a pointer mistake. This line from the tutorial didn't work:
struct tcphdr *tcph = (struct tcphdr *) datagram + sizeof(struct ip);
and it worked...

Hi, im trying to lern about raw sockets with my debian and c++. Tried to make a icmp and tcp packet and send it with sendto. Checked on wireshark and recognized that kernel changed my headers. So...