[ntp:questions] Reachable and rejected

Dave Close dave at compata.com
Fri Sep 12 19:45:18 UTC 2008


David Woolley <david at ex.djwhome.demon.co.uk.invalid> writes:

>Dave Close wrote:

>> What I haven't found while reading is how it is possible for a server to
>> be both reachable and rejected. Note that the reject condition is not

>That's quite easy, but I can't see a case which applies here (using a 
>not recently synchronised w32time server (NAT would make no difference), 
>kiss of death because of the excess query rate from the router (I think 
>the refid would be special); the two servers have error bands that do 
>not overlap (I can't remember whether this would produce a special flag 
>in the ntpq output))

>> constant; the servers are accepted occasionally, but not for very long.

>That does sound like kiss of death, except for the refid.

>What would help is the result of running rv against each association ID, 
>to get the detailed state for the association.

Ok, here goes. I hope this means something to someone else...

# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 server1         172.16.2.5       2 u   24   64  377    2.159  -51835.   8.729
 server2         172.16.2.5       2 u   46   64  377    2.200  -51822.  19.581
# ntpq -c as
ind assID status  conf reach auth condition  last_event cnt
===========================================================
  1 20192  9024   yes   yes  none    reject   reachable  2
  2 20193  9024   yes   yes  none    reject   reachable  2
# ntpq
ntpq> rv 20192
assID=20192 status=9024 reach, conf, 2 events, event_reach,
srcadr=taus-idc2.dom1.taus.us.thales, srcport=123,
dstadr=192.168.58.250, dstport=123, leap=00, stratum=2, precision=-7,
rootdelay=0.000, rootdispersion=14089.050, refid=172.16.2.5, reach=377,
unreach=0, hmode=3, pmode=4, hpoll=6, ppoll=6, flash=400 peer_dist,
keyid=0, ttl=0, offset=-51835.943, delay=2.159, dispersion=9.549,
jitter=10.021, reftime=cc74ddf3.bd083558  Fri, Sep 12 2008  5:24:19.738,
org=cc754432.c147ae14  Fri, Sep 12 2008 12:40:34.755,
rec=cc754466.9b66e174  Fri, Sep 12 2008 12:41:26.607,
xmt=cc754466.9ad85a70  Fri, Sep 12 2008 12:41:26.604,
filtdelay=     2.17    2.20    2.16    3.68    4.14    2.25    4.47    2.24,
filtoffset= -51850. -51846. -51835. -51848. -51831. -51832. -51829. -51846.,
filtdisp=      7.81    8.80    9.75   10.72   11.70   12.66   13.65   14.59
ntpq> rv 20193
assID=20193 status=9024 reach, conf, 2 events, event_reach,
srcadr=taus-idc1.dom1.taus.us.thales, srcport=123,
dstadr=192.168.58.250, dstport=123, leap=00, stratum=2, precision=-7,
rootdelay=0.000, rootdispersion=14089.630, refid=172.16.2.5, reach=377,
unreach=0, hmode=3, pmode=4, hpoll=6, ppoll=6, flash=400 peer_dist,
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,
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
-- 
       Dave Close, Compata, Costa Mesa CA       +1 714 434 7359
       dave at compata.com              dhclose at alumni.caltech.edu
     "Technology has the shelf life of a banana." - Scott McNealy

-- 
Dave Close, Compata, Costa Mesa CA  "Politics is the business of getting
dave at compata.com, +1 714 434 7359    power and privilege without
dhclose at alumni.caltech.edu           possessing merit." - P. J. O'Rourke




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