On Fri, Jan 3, 2014 at 10:13 AM, James Knott <james.knott@rogers.com> wrote:
Anton Aylward wrote:
From my POV having an old or tiny box dedicated to DNS with a couple of gigs of memory[1] with a -ing cache and a -ing long timeout will 'outperform' all of the above after a couple of days, provided I don't turn it off at night.
Actually, the time to live value in the returned DNS reply will limit any caching. I just did one test for Yahoo and it showed 34 seconds. Another one showed 3 min 2 sec, so upstream caches will return a varying TTL depending on when they obtained the record. Those times are nowhere near "overnight".
I had no idea TTLs were so short these days. When I was admin'ing DNS 15+ years ago, a week was a very common TTL (time-to-live). If the majority are down in the minutes area now, it is even more important to have a busy DNS server in your query forwarding logic somewhere. My ISP is huge, so I just use theirs. Greg -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org