Authoritative Resources for Public DNS Pinging

Thu Feb 10 20:20:35 UTC 2022

On 2022-02-10 11:42, John Todd wrote:

> "The Prudent Mariner never relies solely on any single aid to 
> navigation"

It's best to ping multiple targets, and take action only if all targets 
do not return replies.

For route tracking a la $VENDOR_C's IP SLA, if possible, we'll ping 
next-hop IP, one target on our network, and one off our network.  
Withdraw the default route only if all three targets fail to return 
replies.

> John Todd - jtodd at quad9.net
> General Manager - Quad9 Recursive Resolver

./btk