whether SERVFAIL is cached by caching server
Barry Margolin
barmar at alum.mit.edu
Sat Dec 10 02:03:58 UTC 2005
In article <dnbg4e$2cqn$1 at sf1.isc.org>,
Sanjib Das <Sanjib.Das at lntinfotech.com> wrote:
> Hi
> I have setup a local domain my.domain. & it consists of two machines...
> I configured one of them as primary server for my domain & another one
> as caching server .For both these servers I'm using BIND-9.2.4 package
> whenever I send query (using 'dig' command).....
> from the second machine (machine where the caching server is running
> locally) first it looks into its own cache....if its available it sends
> from there
> itself... otherwise sends it to the primary server...
> Now say I got a SERVFAIL in the reply.... in this case whether my
> caching server will cache this information...coz I found that
> whenever I send the same query to the same server(second time after
> getting SERVFAIL)..it sends to the server again....that means what I
> believe the resolver (caching server) is not cqaching this kind
> of(SERVFAIL)
> response....
>
> Please let me know whether my analysis is right or wrong....
Your analysis is correct. Errors are not generally cached, only valid
responses are. As a result, it's not uncommon to see high volumes of
repeated queries due to misconfigured servers like this.
--
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
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