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[ale] cacheing DNS?



One thing is, even if you have internal dns, having 1 external one is
handy, as I realized over the weekend. With wtf is my site down, only
to realize my internal dns was down.

On 5/8/12, Leam Hall <leamhall at gmail.com> wrote:
> On 05/08/2012 05:46 PM, John Heim wrote:
>> I'm confused about caching DNS and recursion. I keep reading that best
>> practice is to not use the same dns servers for the machines on your LAN
>> as
>> you do for those outside your LAN. So if I'm the admin of example.org and
>> if
>> I want redundant DNS servers for both internal and external queries, do I
>> have to run four DNS servers?  Do people really do that?
>>
>
> Hey John,
>
> I think the normal process is to have your DNS servers also cache
> external info. Of course, you can set up a caching name server on each
> host. It's not that difficult and might help if your doing a lot of
> activity with the same sites.
>
> Keep in mind that the nameserver directive in /etc/resolv.conf can only
> have 3 entries, IIRC.
>
>
> Leam
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