[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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