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August 22, 2011
Internal Versus External DNS Provision
By Joe Purcell
DDoS attacks and poisoning techniques are posing major issues for IT departments today, and increasingly so. Additionally, the need for greater scale and speed is pushing IT towards resourcefulness. Revisiting the question of where DNS providing should come from may discover solutions for some of these issues.

Certainly there are pros and cons to choosing internal, external, or ISP based DNS provision. There is no one size fits all. As a result, IT departments may benefit from changing how their DNS is provided. First, let's look at internal DNS provision. One instance where an internal DNS would be beneficial is on a network where one wants to be able to have local hostnames resolved without setting configuration on each computer. Another instance where it would be extremely beneficial is caching. As the link explains, a service that sends a lot of emails will have to do DNS lookup on each of those emails. If those lookups are cached the process will go significantly quicker. Or, perhaps the current DNS service does not support DNS caching in which case an internal solution would be extremely beneficial as well. To check if your DNS provider handles caching, try the following:

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