On 2013-03-13T02:35:06+0100, oliver domke <[email protected]> wrote:
> You can setup multiple servers, but only one IP is fetched from a DNS
> server at a time. That's a fact of the DNS system. If IPv6 is running
> properly, AAAA records are priorised. That means that every client able to
> use IPv6 will use IPv6.

That's not true, a DNS answer can certainly contain multiple A and
AAAA records. Just try "host -v 2.pool.ntp.org" and you'll see.

If you were talking specifically about ntpd, that's also not the case
with the "pool" configuration command in recent ntpds:
http://www.eecis.udel.edu/~mills/ntp/html/discover.html#pool

The pool command will use IPv4 and IPv6 addresses (I assume it only
uses one or the other if you're single-stacked, but all my machines
are dual-stack, so I can't test that).

ntp 4.2.6 has the pool command, and 4.2.7 (the development version)
improves pool behavior. IMO the pool command should be the recommended
configuration on http://www.pool.ntp.org/en/use.html but then you
might have to complicate things by talking about compatible software
versions.

-- 
Kenyon Ralph

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