CLOCKDIFF(8) System Manager's Manual: iputils CLOCKDIFF(8) 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 prespec- ified hop addresses instead of four term one. What flavor works better depends on target host. Particularly, -o is better for Linux. WARNINGS o Some nodes (Cisco) use non-standard timestamps, which is allowed by RFC, but makes time- stamps mostly useless. o 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. o 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 AT ms2.ru>. It was based on code borrowed from BSD timed daemon. It is now maintained by YOSHIFUJI Hideaki <yosh- fuji AT skbuff.net>. SECURITY clockdiff requires CAP_NET_RAW 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 at http://www.skbuff.net/iputils/iputils-current.tar.bz2. iputils-160308 CLOCKDIFF(8)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2024-04-23 22:08 @3.17.150.89 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)