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clockdiff
8
iputils-&snapshot;



clockdiff
measure clock difference between hosts




clockdiff
-o
-o1






[2]
packets or, optionally, IP TIMESTAMP option
[3]
option added to ICMP ECHO.
[1]







 
  
  
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).
  
 

 
  
  
Slightly different form of 
 







 
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 
 








,

,

.





[1] ICMP ECHO,

RFC0792, page 14.


[2] ICMP TIMESTAMP,

RFC0792, page 16.


[3] IP TIMESTAMP option,

RFC0791, 3.1, page 16.





Alexey Kuznetsov
<kuznet@ms2.inr.ac.ru>. It was based on code borrowed
from BSD 










ftp://ftp.inr.ac.ru/ip-routing/iputils-current.tar.gz.






This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License Version 2.

This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
 
For more details see the file COPYING in the source
distribution of Linux kernel of version 2.4.



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