On Feb 20, 2015, at 10:55 AM, Jan Ceuleers <jan.ceule...@computer.org> wrote:
> Using dig on a sample of the pool it seems that DNS queries to the pool
> only ever return 4 entries.

Per request, yes-- with something like a 150 or 300 second TTL.
Hopefully, you get a different set of hosts returned from:

dig 0.uk.pool.ntp.org  ..vs..
dig 1.uk.pool.ntp.org

> So if ntpd relies on there being around 10 servers for some of its monitoring
> capabilities to kick in then we seem to have a bit of a disconnect.

ntpd wants to have at least 4 servers around for falseticker detection.

Using the pool directive should encourage it to get at least 5 - 6 sources,
but you might have to wait some time before it re-queries for new servers
if you only listed a single pool directive.

Regards,
-- 
-Chuck

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