On Sun, 2008-03-09 at 22:02 -0700, John R Pierce wrote:
> Manish Kathuria wrote:
> > What is the maximum number of nameservers mentioned in /etc/resolv.conf
> > which will be queried while looking up a hostname or IP address in the
> > present version ? Earlier implementations had a ceiling of 3 name
> > servers which could be queried. Has there been any increase ?
> >
>
> only one server is ever queried. only if it if it can't be reached at
> all will it fall back on the 2nd one (and if that can't be reached, the
> 3rd) a answer of 'host not found' from the primary server does /not/
> trigger any fallback, instead it returns "not found".
>
> so, why would you need more than 3 ? DNS servers should have a .9999
> uptime.
The idea is to switch between multiple internet links for the same
internal network, without making frequent changes to /etc/resolv.conf.
The ISPs here don't allow DNS look ups from an IP not belong to their
address, so a number of look up requests get denied when the outgoing
connection is through another ISP. Of course, I can run a caching
nameserver on the small network or use Open DNS servers but that adds to
the delay.
Thank you,
Manish
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