clockdiff man page on Manjaro

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clockdiff(8)							  clockdiff(8)

       clockdiff - measure clock difference between hosts

       clockdiff [-o] [-o1] {destination}

       clockdiff  Measures  clock difference between us and destination with 1
       msec resolution using ICMP TIMESTAMP [2] [clockdiff(8)] packets or, op‐
       tionally,  IP  TIMESTAMP option [3] [clockdiff(8)] option added to ICMP
       ECHO.  [1] [clockdiff(8)]

       -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.

       · Some  nodes  (Cisco) use non-standard timestamps, which is allowed by
	 RFC, but makes timestamps mostly useless.

       · Some nodes generate messed timestamps (Solaris2.4), 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.

       ping(8)[Cross reference to  non-existant	 ID  “ping”],  arping(8)[Cross
       reference to non-existant ID “arping”], tracepath(8)[Cross reference to
       non-existant ID “tracepath”].




       clockdiff was compiled by Alexey Kuznetsov
       ⟨⟩  . It was based on code borrowed from BSD
       timed daemon.  It is now maintained by YOSHIFUJI Hideaki yoshfu‐ ⟨⟩ .

       clockdiff requires CAP_NET_RAW capability to be executed. It is safe to
       be used as set-uid root.

       clockdiff is part of iputils package and the latest versions are avail‐
       able  in	 source	 form  at  ⟨‐

iputils-			13 August 2013			  clockdiff(8)

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