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Date: Mon, 29 Sep 1997 20:39:08 +0900
From: MATSUI Hirokazu <Hirokazu.Matsui@open.enicom.co.jp>
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Subject: [FreeBSD-users-jp 18656] Re: xntpd
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$B>>0f$G$9!#(B

$B$9$G$K;3K\$5$s$,$4;XE&$J$5$C$F$$$^$9$,!"F0$+$J$$J}$O(B stratum $B$NLdBj$G(B
$B$7$g$&!#(B

$B$"$H!"@h=R$N(B http://www.eecis.udel.edu/~ntp/database/faq.html$B$K2<$N$h(B
$B$&$K$"$k$N$G!"(Bstratum $B$N:9$O#20J>e$K$7$?J}$,NI$$$h$&$G$9!#(B

# $B;d<+?H$O(B peer $B$N@_Dj$O$d$C$?$3$H$"$j$^$;$s!#(B
# $B$b$7!"$h$m$7$1$l$P;n$7$FJs9p$$$?$@$1$k$H$"$j$,$?$$$G$9!#(B

------------- $B0zMQ$3$3$+$i(B -----------------
Thanks to Cary Gray for pointing out that the master and backup need to
be separated by 2 strata, not 1.  The reason is (in Cary's words):

> If you configure the local clock for host A a stratum 6 and for B at
> stratum 7, and A and B peer, then B's peers are:
>   A at stratum 7 [sync'd to A's clock at stratum 6]
>   B's clock at stratum 7
> For any of the NTP implementations, B is almost certain to prefer the
> second peer, which will have lower dispersion and synchronizing distance
> (unless you've done some very careful work with the fudge factors).
>
> I learned this the hard way using ntpd back at Stanford.
> 
>       Cary

---------------- $B$3$3$^$G(B ------------------
+----------------------------------------------------------------------
|               $B>>0f9@0l(B (matsui@open.enicom.co.jp)

