[ntp:questions] ***SPAM*** Re: Re: Bad NTP servers jeopardizing the pool.ntp.org initiative

Danny Mayer mayer at ntp.isc.org
Mon Mar 26 05:57:04 UTC 2007

Hal Murray wrote:
>> You don't want to re-resolve anything unless you use up all the
>> addresses you've already retrieved. We don't do this today and I intend
>> to fix.
> I smell a bottomless pit, but it might be appropriate to
> check the DNS info occasionally.  NTP servers are often
> up for a long time - long enough that the systems they are
> using might get renumbered and such.
> I'm sure what the right heuristics are.  Maybe something
> like once-a-month and if DNS fails, keep using the old address
> as long as it works.
> Maybe check DNS sooner if the target server has not responded for a
> few hours.

Yes, it could be that. The idea was laid out in previous messages. I
guess I need to document this in the twiki.

Basically you move on to the next address if the first one does not
respond (for some number of queries). When it runs out it requeries.


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