DNS pulling BGP routes?
Masataka Ohta
mohta at necom830.hpcl.titech.ac.jp
Thu Oct 7 16:50:33 UTC 2021
William Herrin wrote:
> It wasn't forgotten. Folks gained a lot of experience with anycast DNS
> between 2002 and 2006. Not withdrawing the routes when the servers are
> deemed malfunctioning turned out not to be an operationally sound
> practice. The theory offered in 3258 was wrong.
So, from limited experience, you thought it were wrong because:
> Simply
> turning themselves off, instead of withdrawing the routes, would
> result in suboptimal performance.
But, this time, the reality strikes back.
That you can be safe 99 times out of 100 can mean remaining
1 time is totally disastrous.
When servers are deemed malfunctioning, the best practice is
to check whether the servers are really malfunctioning or not
before blindly shutdown the servers.
Masataka Ohta
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