tcp_tstamp_always

Description

If set to 1, TCP always sends SYN segment with the timestamp option. 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.

Default

0 (disabled)

Range

0 (disabled), 1 (enabled)

Dynamic?

Yes

When to Change

In summary, if an accurate measurement of round trip time (RTT) and TCP sequence number wraparound is a problem, enable it.

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

Commitment Level

Unstable