How to tell if TCP Timestamps are in use?

Solution Verified - Updated -

Issue

  • How to tell if TCP Timestamps are in use?
  • Is there any way to tell if TCP Timestamps are being used besides the TSval/TSecr in Wireshark, or TS val/TS ecr in tcpdump?

Environment

  • Red Hat Enterprise Linux 7 and later
  • TCP (Transmission Control Protocol)
  • TCP Timestamps enabled (sysctl net.ipv4.tcp_timestamps = 1)

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