[ntp:questions] negative estbdelay?

Danny Mayer mayer at ntp.isc.org
Tue Oct 23 21:45:41 UTC 2007


Dave Johnson wrote:
> Danny Mayer writes:
>> If you are not using autokey authentication then it doesn't do the
>> autokey dance and as a result is unable to estimate the delay between
>> the broadcast client and the broadcast server. You didn't include the
>> client or server config file so it's hard to be sure.
>>
>> Danny
> 
> Even though, it should be doing a burst on startup to calculate some
> sort of delay right?  I usually see 0.004 sec on all clients.
> Shouldn't some sanity checking of the calcualted delay catch this?
> 
> 
> No auth is on. This is an isolated, unconnected subnet.  Once host is
> setup for broadcasting as a local reference, all other hosts are
> clients of that one host.
> 

Authentication is OFF. disable auth disables authentication. Therefore
your client is totally passive and never sends a packet to the server
and therefore it cannot estimate the delay.

Danny
> 
> server:
> ------
> 
> started as:
> ntpd --panicgate --configfile=/var/run/ntp.conf --pidfile=/var/run/ntp.pid
> 
> $ cat /var/run/ntp.conf 
> disable auth
> disable stats
> disable kernel
> server 127.127.1.1 minpoll 4 maxpoll 4
> fudge 127.127.1.1 stratum 0 refid EXTL
> broadcast bcast minpoll 4 maxpoll 4
> 
> $ grep bcast /etc/hosts
> 172.16.63.255  bcast
> 
> $ ntpq -c lpeers
>      remote           refid      st t when poll reach   delay   offset  jitter
> ==============================================================================
> *LOCAL(1)        .EXTL.           0 l    1   16  377    0.000    0.000   0.001
>  bcast           .BCST.          16 u    -   16    0    0.000    0.000   0.001
> 
> 
> client:
> ------
> 
> started as:
> ntpd --panicgate --configfile=/var/run/ntp.conf --pidfile=/var/run/ntp.pid
> 
> $ cat /var/run/ntp.conf 
> driftfile /var/lib/ntp/ntp.drift
> disable auth
> disable stats
> broadcastclient
> 
> $ ntpq -c lpeers
>      remote           refid      st t when poll reach   delay   offset  jitter
> ==============================================================================
> *card8           .EXTL.           1 u   15   16  377    0.001    0.338   0.069
> 




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