Authoritative Resources for Public DNS Pinging

Sat Feb 12 09:23:55 UTC 2022

On 2/11/22 14:27, Mike Hammett wrote:

> The device that caused this whole conversation has failover 
> functionality. Both interfaces ping an FQDN (that resolves to 8.8.8.8 
> and 1.1.1.1, with the device only latching on to one of those). If any 
> of those meet the failure threshold, that interface is taken out of 
> the traffic flow.
>
>
> So because someone else built a device (without a meaningful 
> configuration to set otherwise), 8.8.8.8 went down for ICMP, and thus 
> Internet ports began flapping, despite the Internet as a whole working 
> just fine.

Pretty amazing, isn't it?

Mark.
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