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clockdiff (8)
  • clockdiff (8) ( Русские man: Команды системного администрирования )
  • >> clockdiff (8) ( Linux man: Команды системного администрирования )
  •  

    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 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 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.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    OPTIONS
    WARNINGS
    SEE ALSO
    REFERENCES
    AUTHOR
    SECURITY
    AVAILABILITY


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