Oracle® Solaris 11.2 Tunable Parameters Reference Manual

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Updated: December 2014



If set to 1, TCP always sends a SYN segment with the timestamp option. If set to 2, timestamps are completely disabled, regardless of whether the TCP connection was opened actively or passively. Note that if TCP receives a SYN segment with the timestamp option, TCP responds with a SYN segment with the timestamp option even if the parameter is set to 0.


0 (disabled)


0 (disabled), 1 (enabled), or 2 (disabled regardless of how TCP connection was opened)



When to Change

If getting an accurate measurement of round-trip time (RTT) and TCP sequence number wraparound is a problem, enable this parameter.

Refer to RFC 1323 for more reasons to enable this option.

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