802.11 frames gets resent by my linux

My program is sending custom 802.11 frames for WPA handshake, like authentication , association or acknowledgement . Yet the operating resend the same packet with modifying its radiotapheader and removing the FCS. A screenshot from wireshark: the ack and auth packets are 40 and 60 bytes in length. Yet they are resent automatically by linux OS. OS modifies the packet header as can be seen below. This is the original radiotap header flags: This is the header of the modified and the one sent by the OS. It sets data retries and TX flags... So the resulting header size shrink by 13... Also it remov

Question by C.Unbay on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.