Slightly OT: Using ISP's DNS server as forwarder with local caching dns server

[Will McDonald]

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On 18/11/05, Ugo Bellavance <ugob at camo-route.com> wrote:
>        I was reading Sendmail's bat book and it was saying that it was better
> to use a "busy" DNS server, to make sure the entries don't time out.
>
>        I run a caching name server (redhat's package, using bind) and I was
> wondering if I could get a benefit of having my ISP's DNS server as a
> forwarder.  From what I can understand, the forwarder will be used if my
> local server does not have the answer in the cache.  If my ISP has the
> entry in cache, it would be faster to retrieve it this way than doing
> the whole query by my local server.
>
>        Any opinions?  Is that actually possible with the redhat package+edits
> or I'd need to configure bind manually to set the caching+forwarders to
> avoid conflicts?

We have 2 dedicated local name servers (used by internal client
systems and servers) and then caching nameservers on each MailScanner
system pointing to those dedicated nameservers as their forwarders.
The busy nameservers in this scenario with the rich cache being the
dedicated ones.

You need to be wary of the caching-nameserver package in that any
updates to the package will overwrite any changes you make to
named.conf. As opposed to the more usual RPM behaviour of creating an
.rpmnew file.

http://lists.centos.org/pipermail/centos/2005-November/014973.html

Will.

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