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    The following form allows you to view linux man pages.

    Command:

    clockdiff

    
    
    

    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 mes-
                  sages. 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. Particu-
                  larly, -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  synchro-
             nized  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.  It is now maintained
           by YOSHIFUJI Hideaki <yoshfuji@skbuff.net>.
    
    
    

    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
    
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