From owner-freebsd-isp Wed Dec 2 16:32:14 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id QAA28251 for freebsd-isp-outgoing; Wed, 2 Dec 1998 16:32:14 -0800 (PST) (envelope-from owner-freebsd-isp@FreeBSD.ORG) Received: from enya.hilink.com.au (enya.hilink.com.au [203.8.14.116]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id QAA28242 for ; Wed, 2 Dec 1998 16:32:08 -0800 (PST) (envelope-from danny@enya.hilink.com.au) Received: from localhost (danny@localhost) by enya.hilink.com.au (8.8.8/8.8.7) with SMTP id LAA18877; Thu, 3 Dec 1998 11:31:47 +1100 (EST) (envelope-from danny@enya.hilink.com.au) Date: Thu, 3 Dec 1998 11:31:46 +1100 (EST) From: "Daniel O'Callaghan" To: jonathan michaels cc: freebsd-isp@FreeBSD.ORG Subject: Re: network time and host synchronisation In-Reply-To: <19981130181836.D15528@caamora.com.au> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Many ISPs set their routers to use NTP and you can take time from nearby ones, if you feel they are accurate enough. To see what routers might be using NTP, try 'traceroute www.telstra.net' and then use the command 'xntpdc -p possible.ntp.host' for each hop. Danny e.g. helium: {22} traceroute www.telstra.net. traceroute to www.telstra.net (139.130.204.2), 30 hops max, 40 byte packets 1 legend (203.8.14.121) 0.607 ms 0.786 ms 0.506 ms 2 bur-gw (203.8.14.119) 1.995 ms 8.214 ms 1.876 ms 3 serial2-1.bdr0.mel.paradox.net.au (202.61.240.145) 22.479 ms 10.687 ms 28.301 ms 4 fe0-0.core0.mel.paradox.net.au (202.61.240.62) 12.906 ms 18.584 ms 10.901 helium: {23} xntpdc -p 202.61.240.145 xntpdc: read: : Connection refused helium: {24} xntpdc -p 202.61.240.62 remote local st poll reach delay offset disp ======================================================================= *tictoc.tip.CSIR 202.61.248.162 1 512 377 0.07129 -0.014908 0.03447 OR phoenix# traceroute www.telstra.net. traceroute to www.telstra.net (139.130.204.2): 1-30 hops, 38 byte packets 1 border-ed3.gw.aus.net (203.29.224.30) 1.52 ms 1.17 ms 1.14 ms 2 gw-eth0.gw.aus.net (203.8.15.9) 2.22 ms 2.70 ms 2.42 ms 3 Serial5-4.lon3.Melbourne.telstra.net (139.130.4.25) 19.9 ms 23.4 ms 13.3 ms 4 Fddi0-0.lon-core2.Melbourne.telstra.net (139.130.239.227) 10.7 ms (ttl=251!) 53.4 ms (ttl=251!) 19.7 ms (ttl=251!) 5 Hssi4-0-0.civ-core1.Canberra.telstra.net (139.130.239.174) 23.3 ms (ttl=250 phoenix# xntpdc -p 139.130.4.25 remote local st poll reach delay offset disp ======================================================================= =lon-core2.Melbo 0.0.0.0 3 256 377 0.00327 0.000523 0.00047 *lon-core1.Melbo 0.0.0.0 2 256 377 0.00208 0.000390 0.00191 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message