Replying to Charles Elliott: > The offset may be a function of distance. Try this experiment: > Set up your ntp.conf file to have three servers . . . : > 1. A relatively unused stratum 1 or 2 server as close to you as possible > 2. A relatively unused stratum 1 or 2 server about 1,000 miles away > 3. A relatively unused stratum 1 or 2 server more than 2,000 miles away
OK, here is information taken from two local servers under my control. ============================================================================== This first machine (171.67.203.16) is on the Stanford University campus. The first two peers listed below are located on the Stanford campus; the third peer is also run by Stanford but is about 50 miles east of the campus. +171.64.7.105 .PPS. 1 u 1012 1024 377 0.465 -0.045 0.076 +171.64.7.67 .PPS. 1 u 217 1024 377 0.584 -0.043 0.081 *204.63.224.70 .PPS. 1 u 737 1024 377 1.803 -0.031 0.252 This next peer is my home machine (the one I described earlier as being connected to the Internet via a cable modem), with its own local GPS clock. -68.65.164.12 .PPS. 1 u 13 16 372 8.168 -2.126 4.585 Finally, these two servers are in Utah (Xmission) and Poland. -198.60.22.240 .GPS. 1 u 721 1024 377 18.931 0.239 0.045 -213.222.200.99 .PPS. 1 u 833 1024 377 172.099 -4.083 1.167 ============================================================================== Now, here is the info from my home machine (68.65.164.12). First, my local GPS reference clock: *127.127.28.1 .PPS. 0 l 14 16 377 0.000 -0.003 0.025 x127.127.28.0 .GPS. 8 l 7 16 377 0.000 -37.762 13.399 Next, my campus machine (see above for details): -171.67.203.16 204.63.224.70 2 u 2 16 333 9.689 2.146 3.930 And finally, the same two remote servers (in Utah and Poland) that I used on my campus machine: +198.60.22.240 .GPS. 1 u 45 64 377 35.222 6.542 2.864 +213.222.200.99 .PPS. 1 u 18 64 377 191.192 4.890 8.968 ============================================================================== Any thoughts? Rich Wales [email protected] _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
