On 11/25/2014 12:08 PM, D. Hugh Redelmeier wrote: > | From: James Knott <[email protected]> > > | What's your cache time? A cache will typically hold the data for a > | short time, to keep stale data from propogating. It might be as short > | as a few minutes. A cache certainly won't survive a reboot. > > I don't know about local policy, but each DNS record has a TTL which > is supposed to limit the time it is cached. I imagine that these > are generally honoured by a caching server to avoid overloading the other > servers. > >
The original TTL was 24 hours. But that's a bit long these days. It's a balance between "overloading" and stale addresses. Upper level servers tend to have long times, local ones shorter. Regardless, I'd expect the cache to be empty on a system that's just been started. Cache as cache can. ;-) --- GTALUG Talk Mailing List - [email protected] http://gtalug.org/mailman/listinfo/talk
