On Thursday, January 23, 2014 12:21:15 PM UTC+1, Marco Marongiu wrote: > On 01/23/2014 11:00 AM, ardi wrote: > > > On Thursday, January 23, 2014 9:36:35 AM UTC+1, Marco Marongiu wrote:> > > Well, I have come across almost all of the pages, you are mentioning below, > > > but it seems, i have "combined" the info wrongly for my example...:-) > > > > :-) > > > > > > > Does it mean these minpoll, maxpoll parameters are not needed in most > > > of the cases? > > > > Yes, that's what I mean. > > > > > > > According to book Expert Network Time Protocol from PETER RYBACZYK: > > > > I don't have that book. I'd appreciate that anyone in this list that has > > reviewed the book can give their opinion about it. > > > > > > > "The minpoll and maxpoll parameters represent minimum and maximum > > > polling intervals for reference clock messages in seconds to the > > > power of 2. For example, if minpoll=3 and maxpoll=4, the minimum > > > polling interval would be 8 seconds, and the maximum polling interval > > > would be 16 seconds." > > > > > > What does "minimum and maximum polling intervals for reference clock > > > messages" mean? > > > polling = messaging with NTP servers to estimate the offset ??? > > > > Yes, but you don't need to query the servers every 16 seconds. Normally, > > once a peer is selected, ntpd gradually extends the polling interval > > from 64 to 128 seconds, to 256, 512, and finally 1024. Querying every 16 > > seconds is a bit obsessive and doesn't bring much more accuracy than the > > standard settings. Not to mention that your references may rate limit > > you, or refuse to talk to you altogether. > > > > > > >> First: don't use two servers, it's the worst possible configuration. > > > > > > Why not? what if one of the servers fail? then the client can get time from > > the other ntp-server. > > > > Please, read this section and my previous message carefully: > > http://www.ntp.org/ntpfaq/NTP-s-algo-real.htm#Q-NTP-ALGO > > > > I am not saying that you should use only one server: I am saying that > > using two is bad, and that you should use four. > > > > Ciao > > -- bronto
Reading: http://www.ntp.org/ntpfaq/NTP-s-algo-real.htm#Q-NTP-ALGO Two time sources cannot be split into two parties where one has a majority. What does this majority means? Peter _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
