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Packet sniff noise

Hi there!

I'm looking to update https://www.youtube.com/watch?v=zj2vLZOVOT0

and I'm up and running here: https://s.natalian.org/2019-04-17/wireshark.mp4

But there are lots of spurious entries like:

  • Code: 3 (Port unreachable)
  • [TCP Dup ACK 114#1]
  • [TCP Out-Of-Order]

Is it a misconfiguration as to how I packet sniff with my Mikrotik? Am I missing a filter?

Many thanks,