Re: (DNS) consensus wording
Anawat Chankhunthod (chankhun@catarina.usc.edu)
Sat, 30 Mar 1996 17:53:49 -0800
> 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