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André's avatar
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André
answered 2021-04-06 18:11:34 +0000

Based on the RFC 791 https://tools.ietf.org/html/rfc791 , I read the flags as:

  • MF set: this packet contains a fragment,
  • DF set: this packet cannot be split into (smaller) fragments.

The combination makes it: this packet contains a fragment which in turn may not be split into smaller fragments.
So while unusual, it is allowed.