On 2/6/2013 1:45 PM, Robert Scott wrote:> Here is a related question: Suppose I
wanted to
> improve my SNTP implementation by accessing several
> servers in a short span of time?
> (But I don't want the full overhead of NTP.)
> If DNS caching is returning the same address then
> how can I get several independent servers from
> the pool?
> I don't think an iPhone app can turn off DNS caching
> programmatically.
The DNS cache is not likely in the phone, but rather at the ISP end.
If whenever you want to check the time
{If it has been at least a minute since the last check.}
Do a query for:
0.vendor.pool.ntp.org
1.vendor.pool.ntp.org
2.vendor.pool.ntp.org
3.vendor.pool.ntp.org
Each should return 4 A records, likely not overlapping.
That should get you 12 to 16 IPs.
Then ask 4 of those IPs for the time, ...
I don't see the issue.
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