I have two hosts:

  • alice (, mtu 9000)
  • bob (, mtu 1500)

They are directly connected with a cat 6 cable, with no switch in between.

Why is it that I can still ping bob from alice, with a large packet size? E.g.:

$ ping -M do -s 8000

According to the manpage of ping, the -M do option is supposed to prohibit packet fragmentation.

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