I try to catch zones that are not updating on the slaves to which I have access. I compare the modtime of the zone file with the current time and the refresh interval for the zone. Typically I allow a failure or two before alerting, e.g. wait 1 refresh + 2 retry intervals. If the expire interval is very short, this could be too late.
Depending upon the expire interval and refresh interval, the window in which you can be alerted and troubleshoot a problem might be short. If you're slaving zones for another site, you might not have control of that. If you find out refreshes aren't happening long before the expiration, and if the zone is pretty static (e.g. a single www.example.com address), you don't have to jump very fast to address things if the expire interval is weeks. If folks are depending upon records that are dynamic, you want to respond pretty quickly. John Wobus _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users