Standard UNIX utility to measure round trip delay, using standard method - send ICMP packet and receive response and measure delay. https://linux.die.net/man/8

Standard UNIX utility to measure round trip delay, using standard method - send ICMP packet and receive response and measure delay. https://linux.die.net/man/8/ping https://linux.die.net/man/8/ping Sure, it is not 100% reliable and in some cases it could show values not corresponding to real delay.