- From: Anawat Chankhunthod <chankhun@catarina.usc.edu>
- Date: Sat, 30 Mar 1996 17:53:49 -0800
- To: Koen Holtman <koen@win.tue.nl>
- Cc: jg@w3.org, http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
> Change to: > > If clients cache the results of name lookups for performance reasons, > they are strongly encouraged to get and observe the TTL (Time To > Live) information reported by the name server. If this is not > feasible, clients must not cache the results of name lookups for > longer than 10 minutes, and must immediately discard a name lookup > result if a network error occurs when using the result to initiate a > connection. I have some additional ideas. Danzig., et.al (SIGCOMM92 ??) shows that NEGATIVE caching DNS will help to reduce DNS traffic quite a bit. Negative cache means when DNS lookup fail (may be after 2-3 trails) for that particular host, we should cache the result (the failure) for a short time to avoid subsequent look up (which likely to fail again). Say 2 minutes. Anawat
Received on Saturday, 30 March 1996 17:59:10 UTC