CLOCKDIFF

clockdiff − Measures clock difference between us and <destination> with 1msec resolution. Without -o option it uses icmp timestamps, with -o it uses icmp echo with timestamp IP option.

clockdiff [-o|-o1] <destination>

* some nodes (f.e. Solaris<2.4) do not support icmp

timestamps. clockdiff -o still works.

* some nodes (Cisco) use non-standard timestamps,

which makes clockdiff useless.

* some nodes use wrong timestamps (Solaris>2.4), if

run xntpd. Seems, it uses different clock source, which is synchronized to time-of-day clock periodically.

* -o1 uses three-node tstamp. What option (-o or -o1)

works better depends on target host.