-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.
· 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.
This page is part of the iputils (IP utilities) project. Information
about the project can be found at ⟨http://www.skbuff.net/iputils/⟩.
If you have a bug report for this manual page, send it to
email@example.com, firstname.lastname@example.org. This page was obtained
from the project's upstream Git repository
⟨git://git.linux-ipv6.org/gitroot/iputils.git⟩ on 2017-03-13. If you
discover any rendering problems in this HTML version of the page, or
you believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
iputils-151218 13 March 2017 CLOCKDIFF(8)