Re: DNS pulling BGP routes?

[Masataka Ohta <mohta () necom830 hpcl titech ac jp>]

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