On Feb 14, 2012, at 2:59 AM, goran kent wrote: > I need to setup an A record for a machine who's IP might change > unexpectedly, and I need to ensure PCs out there cache it for as short > a time as possible: > > host1 300 IN A 10.10.10.10 > > Does anyone know whether MS windows PCs will in fact honour that 300s, > then force a re-lookup? Can I use even shorter values? eg, 60?
ISC's BIND has (or had) a MINTTL value of 5 minutes / 300 seconds. It's probably unreasonable to expect other platforms to refetch DNS records faster than that. Aside from DNS, you're going to run into layer-2 problems with MAC-to-IP mappings in your switches if you try to move an IP around at sub-minute intervals. What problem are you actually trying to solve? It's likely that a tool or mechanism like load-balancing onto a pool of boxes would provide a much better solution than expecting to move a box around so rapidly.... Regards, -- -Chuck _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
