cleanfeed (8)
Measures clock difference between us and with 1msec
resolution. Without -o option it uses icmp timestamps, with -o
it uses icmp echo with timestamp IP option.
SYNOPSIS
clockdiff
[ -o | -o1 ]
<destination>
WARNINGS
* 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.
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