Re: Recommended DNS server for a medium 20-30k users isp

[Mel Beckman via NANOG <nanog () lists nanog org>]

We find SimpleDNSPlus (https://simpledns.plus<https://simpledns.plus/>) scales quite well. It runs under windows, but 
as long as you operated behind a good firewall, it’s not a security issue.

It also can host zones as well, so can double as a recursive name server and as a primary or secondary name server for 
your hosted domains. It includes a nice graphical display of performance metrics.

-mel via cell

On Aug 7, 2025, at 5:45 PM, DurgaPrasad - DatasoftComnet via NANOG <nanog () lists nanog org> wrote:

Hello all,
Do you have any recommendations for recursive DNS servers for a medium sized (20-30k users) ISP.
We have used powerdns and unbound but sometimes find the caching times a bit on upper side. Any suggestions between 
these two or anything new?
Also need points on how much we tune the settings
pros and cons if any.

Thank you /DP
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