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Why Does the Upper Layer Application Function Normally When the TCP Checksum in the Packet Head Gotten on the Windows Platform Is Detected Faulty?

Latest reply: Apr 14, 2017 07:33:56 1186 1 0 0 0

Hello everyone,

Why does the upper layer application function normally when the TCP checksum in the packet head gotten on the Windows platform is detected faulty?

Please help me. Thank you!

  • x
  • convention:

Created Apr 14, 2017 07:33:56

Some network interface cards support the Rx Checksum Offload/Tx Checksum Offload option. Generally, the TCP/IP protocol suite on the Windows platform calculates the TCP/UDP/IP checksum. If the Rx Checksum Offload/Tx Checksum Offload option is enabled on the network card, the network card itself rather than the protocol suite calculates the checksum. In this case, the TCP checksum calculated by the network card is different from the one parsed by the packet head getting software.
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