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clockdiff



SYNOPSIS

       clockdiff [ -o]  [ -o1]  destination


DESCRIPTION

       clockdiff  Measures clock difference between us and desti­
       nation 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 destina­
              tions, 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.


WARNINGS

       · 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.


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 exe­
  




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