Simon Arlott wrote:
On 27/01/07 17:48, Anthony DeRobertis wrote:
Rob Janssen wrote:
However, a "when the server is dead for some time and it was configured
with a DNS name rather than a fixed address, do a new DNS lookup and try
again"
Doing a lookup regardless of whether the server is dead would
additionally help people who want to move servers to new IP addresses.
Just only do the lookup once a day or so (at a random time for each
server), to minimize instability.
ntpd is going to have to discard everything it knows about a server when it
does this...
That (and other reasons) is why it is not a good idea to just regularly
do DNS lookups.
There should be a special condition, like not getting responses for some
considerable time (and maybe after some shorter time when there was
never any response after first using a certain server) when a DNS lookup
is done and the whole thing is reset when a different address is going
to be used.
Time sync experts will certainly not like a solution where the
associations are randomly changed on a regular interval.
Rob
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