On Mon, Aug 31, 2009 at 03:49:50PM +0530, venkatesh.bs wrote:
> Hi all,
> I have one query regarding DNS cache maintaince in dns stub resolver(DNS
> client Not server side cache maintainence), Whether DNS Cache should be
> based on per server address or based on FQDN only.
>
>
> >>1. Query1: Domain name: "google.com" DNS IP: DNS_SERVER_1 -
> >result will
> >>be stored in DNS Cache Meanwhile,DNS Server IP got changed.
> >>2. Query2: Domain name: "google.com" DNS IP: DNS_SERVER_2 - Should we
> >>have to query to DNS Server 2? or Should we have to get it
> >from DNS Cache?
>
>
> Thanks in advance.
> venkatesh.B.S
>
a stub resolver, sort of by definition does not have a cache.
in the presence of a cache, what do you hold on to? if I
query for the A record(s) of google.com, what will i get back?
one rr or multiple?
if multiple, do i put all the answers in cache or only the first one?
how long do things stay in cache?
if google.com changes its IP addresses - how long are your cache
entries valid? why?
once you have the answers to these questions, you will know when
you will go back and ask again what the address record(s) for
google.com are.
you might also read "DNS and BIND" - or go to the helpful DNS web pages
-
or even try "Ask Mr. DNS" for answers to these fairly basic questions.
--bill
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