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

[Damian Menscher via NANOG <nanog () lists nanog org>]

On Mon, Aug 11, 2025 at 3:08 PM Matthew Petach via NANOG <
nanog () lists nanog org> wrote:

> Having been bitten by this in the past...never base your determination of
> "healthy" or "working" on a single external data reference.
> It can be tempting to just assume 8.8.8.8 will always be "up" and
> "pingable" to verify your internet connectivity is good...right up to the
> point where Google has a routing snafu

...

No need for a routing snafu... 8.8.8.8 is current getting a steady-state
27Mpps (million packets/second) of ICMP ECHO_REQUEST.  Internet
connectivity checking is not a service we offer, and there is no SLA for
it, therefore it may go away at any time.  There is a very real risk of me
running an April 1st experiment of "what would happen if I just ACL off all
the pings?".  I might have guessed I'd light up a couple dozen pagers and
start a nanog@ flamewar... but if anyone is basing routing decisions on
that, it will be a "fun" day indeed!

Damian
-- 
Damian Menscher :: Security Reliability Engineer :: Google :: AS15169
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