[ntp:questions] Reachable and rejected
david at ex.djwhome.demon.co.uk.invalid
Fri Sep 12 21:00:04 UTC 2008
Dave Close wrote:
> dstadr=192.168.58.250, dstport=123, leap=00, stratum=2, precision=-7,
Precision -7 is poor, but possibly a contra-indication for the main
hypothesis as I believe that w32time is normally even worse, at -6.
> rootdelay=0.000, rootdispersion=14089.630, refid=172.16.2.5, reach=377,
Root dispersion is excessive. Combined with a stratum of 2, this is
indicative of your using a w32time server rather than an NTP server.
However, NAT should make no difference. By any chance were the machines
outside the NAT w32time clients, rather than NTP clients?
A real NTP server would not report root delay as zero unless it had a
directly connected reference clock. The reference ID indicates that
that is not the case, and the stratum is suggestive that it isn't the
case. Again it looks as though you are not talking to an NTP server and
probably talking to a w32time one.
What I think you can safely say is that you are not talking to an NTP
(Basically, the rootdispersion is telling you that the server hasn't had
an update for so long that it can't be sure of its own time to better
than 14 seconds. NTP requires that, after adding extra errors for the
hop to the client, that it know to better than one second.)
> unreach=0, hmode=3, pmode=4, hpoll=6, ppoll=6, flash=400 peer_dist,
peer_dist is telling you what I just said.
> keyid=0, ttl=0, offset=-51822.970, delay=2.200, dispersion=12.060,
> jitter=24.499, reftime=cc7533f1.d8de6ddf Fri, Sep 12 2008 11:31:13.847,
reftime looks OK. I wonder if the server is actually reflecting your
rootdispersion. Again, if so, not an NTP server.
> org=cc754459.c0418937 Fri, Sep 12 2008 12:41:13.751,
> rec=cc75448d.9bb36a6e Fri, Sep 12 2008 12:42:05.608,
> xmt=cc75448d.9b19fbd7 Fri, Sep 12 2008 12:42:05.605,
> filtdelay= 2.34 2.64 4.18 3.24 2.71 2.40 2.93 2.20,
> filtoffset= -51856. -51847. -51849. -51851. -51844. -51838. -51840. -51822.,
> filtdisp= 7.81 8.76 9.72 10.69 11.65 12.63 13.59 14.56
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