измерить разницу часов между хостами (measure clock difference between hosts)
Имя (Name)
clockdiff - measure clock difference between hosts
Синопсис (Synopsis)
clockdiff [-o] [-o1] [--time-format ctime iso] [-V] {destination}
Описание (Description)
clockdiff Measures clock difference between us and destination
with 1 msec resolution using ICMP TIMESTAMP [2] packets or,
optionally, IP TIMESTAMP option [3] option added to ICMP ECHO.
[1]
Параметры (Options)
-o
Use IP TIMESTAMP with ICMP ECHO instead of ICMP TIMESTAMP
messages. It is useful with some destinations, which do not
support ICMP TIMESTAMP (f.e. Solaris <2.4).
-o1
Slightly different form of -o, namely it uses three-term IP
TIMESTAMP with prespecified hop addresses instead of four
term one. What flavor works better depends on target host.
Particularly, -o is better for Linux.
-T, --time-format ctime iso
Print time stamp in output either ISO-8601 format or
classical ctime format. The ctime format is default. The ISO
time stamp includes timezone, and is easier to parse.
-I
Alias of --time-format iso option and argument.
-h, --help
Print help and exit.
-V, --version
Print version and exit.
Предупреждение (Warning)
• Some nodes (Cisco) use non-standard timestamps, which is
allowed by RFC, but makes timestamps mostly useless.
• Some nodes generate messed timestamps (Solaris>2.4), when
run xntpd. Seems, its IP stack uses a corrupted clock source,
which is synchronized to time-of-day clock periodically and
jumps randomly making timestamps mostly useless. Good news is
that you can use NTP in this case, which is even better.
• clockdiff shows difference in time modulo 24 days.
Смотри также (See also)
ping(8), arping(8), tracepath(8).
