RHEL5.8 About the calculation method of a TCP checksum

Solution Unverified - Updated -

Issue

  • There were four packets whose TCP checksum is FFFF.
  • We calculated those packets manually, but the value was set to FFFB when we calculated the checksum.

Environment

  • Red Hat Enterprise Linux 5.8
  • Kernel Version: 2.6.18-308.el5.x86_64

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