In your example, you are using TCP time-stamps: https://datatracker.ietf.org/doc/html/rfc7323#section-3
which are not the same as IP time-stamps: https://datatracker.ietf.org/doc/html/rfc781 Instead of: sudo hping3 --fast -c 3 -n -S -p 80 --tcp-timestamp $host try: ping -T tsonly $host J.
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