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

[Saku Ytti via NANOG <nanog () lists nanog org>]

On Tue, 12 Aug 2025 at 01:08, Matthew Petach <mpetach () netflight com> wrote:

> If you're pinging someone else to make sure the internet is still alive, ping several, like 8.8.8.8, 1.1.1.1, and 
> 9.9.9.9, and don't react unless you see failures to reach multiple of them.  Otherwise, it's likely to be their 
> failure, not yours, and there's no reason to make things worse by changing your systems based on their problems.

I am bit repeating myself, apologies.

But do also ensure that your health check is demoting, not removing.
Like changing admin weight to inferior, this way if everything 'fails'
because the health check is bogus, you are back to square 1. Very easy
to with IP SLA/tracking and the like, yet most examples, even at
vendor documentation remove, instead of demote.

-- 
  ++ytti
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