Bob Harold wrote: > Reading these various ideas brings up a question in my mind. If a server > queries for the SOA of a zone and the serial number has not changed, can it > then assume that all of the entries in its cache for that zone should still > be valid now, and for the their original TTL value starting now? If the > values had changed, wouldn't the serial # also change? Seems like I must > be missing something here.
No inferences like that can be drawn based on the SOA SERIAL field, because the serial number may have wrapped around to the same value that was observed previously. (Even if the time between queries is very small, there is still a finite window of time during which the zone publisher can fit as many zone updates into as needed -- at least conceptually.) -- Robert Edmonds _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
