DNS DMZ design?

We're a windows based shop and have been tasked to setup DNS on a DMZ to forward external lookups. From what I've reviewed this will set us to a single point of failure and should be running core. If that is the case do the servers on the DMZ need to be part of the domain? I'm guessing not...

Can anyone provide any other suggestions or recommendation should we move forward with this design?
apimentel26Asked:
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Will SzymkowskiSenior Solution ArchitectCommented:
That is correct. Typically what you want to do is use your local ISP DNS servers as forwarders in your internal DNS setup. Having a DNS server in the DMZ creates more management and really is not anymore secure then what I have mentioned above.

Will.
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David Johnson, CD, MVPOwnerCommented:
could you please explain it better.. you have an internal dns behind a firewall .. this is fine.. in the dmz you don't need nor want a dns server .. protecting this server will be a problem.
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Will SzymkowskiSenior Solution ArchitectCommented:
Are you hosting your own External DNS? Usually domain controllers also hold the DNS role as well. They site on the internal network and query based on forwarders and or root hints in your DNS configuration.

I would then also ensure that you use a 3rd party DNS provider which is much more flexible when it comes to DR scenarios.

Will.
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apimentel26Author Commented:
We have a firewall and AD / DNS Servers which is all internal. My superior has suggested adding a DNS on DMZ where our internal DNS will forward to that as an added layer of security. I'm taking this is not a recommended setup?
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apimentel26Author Commented:
Thank you!
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