[ntp:questions] dumping ntpd's state and multiple IPs/hostname
Danny Mayer
mayer at ntp.isc.org
Fri Sep 14 04:52:06 UTC 2007
Hal Murray wrote:
>> In thinking about this, it looks like this might also be a good time to
>> look at adding an option to the 'server' and 'peer' directives to allow
>> some number of IPs to be used instead of the current "first address
>> only".
>>
>> This feature would help greatly with things like pool.ntp.org .
>>
>> Is this a good idea? (I think so, but I'd like a reality check.)
>
> I think it would be a great idea. The "pool" keyword seems like
> the obvious choice.
>
>> If so, should we just take as many answers as we get, or should we have
>> a limit?
>
> I think there should be a parameter for how many to take.
>
> You should probably save the others. (or the first N of them,
> where N is what fits into a UDP packet)
>
> I assume you realize you are sticking your toe over the edge of
> a slippery slope. The next step is to occasionally dump the
> worst of active server and try another one. Maybe that should
> involve another DNS lookup. If so, you shouldn't stop using the
> ones that are working well.
>
> As a start, you could try another address from the list if one
> you picked doesn't work. And maybe do a new DNS lookup at
> most every few hours if you need another address.
>
See http://support.ntp.org/bin/view/Dev/DNSServerFailover
Danny
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