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RedHat 9 (Linux i386) - man page for clockdiff (redhat section 8)

CLOCKDIFF(8)			 System Manager's Manual: iputils		     CLOCKDIFF(8)

NAME
       clockdiff - measure clock difference between hosts

SYNOPSIS
       clockdiff [ -o]	[ -o1]	destination

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]

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 prespec-
	      ified  hop addresses instead of four term one.  What flavor works better depends on
	      target host. Particularly, -o is better for Linux.

WARNINGS
       o Some nodes (Cisco) use non-standard timestamps, which is allowed by RFC, but makes time-
	 stamps mostly useless.

       o 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.

       o clockdiff shows difference in time modulo 24 days.

SEE ALSO
       ping(8), arping(8), tracepath(8).

REFERENCES
       [1] ICMP ECHO, RFC0792, page 14.

       [2] ICMP TIMESTAMP, RFC0792, page 16.

       [3] IP TIMESTAMP option, RFC0791, 3.1, page 16.

AUTHOR
       clockdiff was compiled by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>. It was  based  on  code
       borrowed from BSD timed daemon.

SECURITY
       clockdiff  requires CAP_NET_RAWIO capability to be executed. It is safe to be used as set-
       uid root.

AVAILABILITY
       clockdiff is part of iputils package and the latest versions are  available in source form
       for anonymous ftp ftp://ftp.inr.ac.ru/ip-routing/iputils-current.tar.gz.

iputils-020927				27 September 2002			     CLOCKDIFF(8)


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