My question is following:
How can I measure the exact time differences (offsets) between two machine?
How can the time differences between two Linux machine be measured accurately? I heard that 'Ping' gives RTT with the association of OS influences therefore not accurate in nanosecond level? If so, what else there have to measure the time difference (offsets) between two machines in Linux based system or Raspi?
Sadly Moderator put it on-hold even after some important developments. He says, This question is off topic here, as it is about a protocol above OSI layer 4 (NTP). It may be on topic on Server Fault or Super User. – Teun Vink♦
Actually, on that question, many contributors talked about NTP, which can be handy to get my objectives. But I did not ask anything about NTP which resides in the Application layer (as up of layer 4 of OSI that moderator indicates). Interestingly PTP also is a potential daemon to utilize reside in Datalink Layer (Layer 2). So what's the point?
Do the sites want to delete my question?