For TCP you're just looking for packets having SYN without ACK. client server --... | Hacker News

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m3047 on Aug 30, 2024 | parent | context | favorite | on: I'm blocking connections from AWS to my on-prem se...

For TCP you're just looking for packets having SYN without ACK.

    client                  server
       -------- SYN --------->
      <-------- SYN+ACK -----

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