[ntp:questions] offline machines' time synchronization

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Wed May 23 21:55:50 UTC 2012


David Woolley wrote:
> BlackList wrote:
>>
>> Add to both?:
>>  tos cohort 1 orphan 11
>>  restrict source nomodify
>>
> If he's offline to the ubuntu server, won't that, effectively,
>  make both server lines redundant,
>  or does orphan require a token server.

If (#ip: 192.168.17.11) can't reach ntp.ubuntu.com ever,
 having "server ntp.ubuntu.com" in the conf is obviously useless.


> One problem I see is that there is no guarantee which machine will
>  be the master in the relationship.

<http://www.eecis.udel.edu/~mills/ntp/html/orphan.html>


{He didn't mention using any automatic server discovery
  pool / manycast / multicast / broadcast / anycast / ... in his conf.}

If he is not using any Automatic Server Discovery,
 the (#ip: 192.168.17.22) client conf,
  would need the "server 192.168.17.11" line ?


(#ip: 192.168.17.11) doesn't know about (#ip: 192.168.17.22),
 if it ever gets to talk to "server ntp.ubuntu.com",
 so much the better; if not, it should chug along on its own.

(#ip: 192.168.17.22) has "server 192.168.17.11" in the conf
 it should follow (#ip: 192.168.17.11) {"the master"}


>> and start ntpd with?: -g

So, if when ntp is started,
 if the offset between the client (#ip: 192.168.17.22)
  and server (#ip: 192.168.17.11) exceeds the panic threshold,
   ntp will step the client #ip: 192.168.17.22)
    to match the server (#ip: 192.168.17.11),
   instead of exiting.


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