Search Again: Re: Caching "No such record"? From: Warren Michelsen Date: Friday, November 2, 2001 Time: 10:00:12 am At 11:29 AM -0600 11/2/01, Len Conrad wrote: >>If a lookup fails, there being no such record for the host name lookup up, is this cached and will subsequent lookups of that host name return the cached "NO such record" response? > >aka "negative caching". > >>For example, If I do a recursive lookup on something via a non-authoritative server and, as a result, realize I've forgotten to add a particular record to the zone, after adding it to the zone on my authoritative server, will lookups done via the same non-authoritative server continue to come up empty until the cache is flushed or the server restarted (or the TTL elapses)? > >If the DNS you are using does negative caching, yes. The cached negative answers will have to expire in the DNS before the DNS will query for new records. So, it's a function of the particular DNS server implementation? It may, or may not cache a negative response? The RFCs permit it either way? -- Internet Tools for Business -- <http://www.CyberSpaces.net/> E-commerce web hosting

Messages In This Thread: Caching "No such record"? by Warren Michelsen on Nov 2, 2001 at 8:15:49 am Re: Caching "No such record"? by Len Conrad on Nov 2, 2001 at 9:30:59 am Re: Caching "No such record"? by Warren Michelsen on Nov 2, 2001 at 10:00:12 am Re: Caching "No such record"? by Len Conrad on Nov 2, 2001 at 12:01:34 pm Re: Caching "No such record"? by Warren Michelsen on Nov 2, 2001 at 3:21:29 pm Re: Caching "No such record"? by Men & Mice Support on Nov 2, 2001 at 7:13:07 pm