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splatcollision on Sept 8, 2016 | parent | context | favorite | on: Browser Fingerprinting

In one of the sections:

> for example, TCP/IP traffic will often reveal high-resolution system uptime data through TCP timestamps.

Is this something that's on by default? Dependent on OS? Not deeply familiar with the details of the TCP stack, but have never hard of something like this being exposed via TCP requests!

splatcollision on Sept 8, 2016 [–]

Did some research - it's off by default in recent macOS versions. Configurable via the "sysctl net.inet.icmp.timestamp" flag.

http://superuser.com/questions/680200/os-x-how-to-make-it-re...

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