Date: Thu, 3 Dec 1998 11:31:46 +1100 (EST) From: "Daniel O'Callaghan" <danny@hilink.com.au> To: jonathan michaels <jon@caamora.com.au> Cc: freebsd-isp@FreeBSD.ORG Subject: Re: network time and host synchronisation Message-ID: <Pine.BSF.3.96.981203092626.15529A-100000@enya.hilink.com.au> In-Reply-To: <19981130181836.D15528@caamora.com.au>
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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
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