title: What benefit is conferred by TCP timestamp?
body: <p>I have a security scan finding directing me to disable TCP timestamps. I understand the reasons for the recommendation: the timestamp can be used to calculate server uptime, which can be helpful to an attacker (good explanation under heading "TCP Timestamps" at <a href="http://www.silby.com/eurobsdcon05/eurobsdcon_silbersack.pdf">http://www.silby.com/eurobsdcon05/eurobsdcon_silbersack.pdf</a>).</p>
  
  <p>However, it's my understanding that TCP timestamps are intended to enhance TCP performance. Naturally, in the cost/benefit analysis, performance degradation is a big, possibly too big, cost. I'm having a hard time understanding how much, if any, performance cost there is likely to be. Any nodes in the hivemind care to assist?</p>