On Wed, Dec 13, 2017 at 05:36:32PM +0800, zuop...@cnnic.cn wrote:
> so far as i know, many CDNs already use similar methods as you mentioned in
> PowerDNS 4.1.1
> but i think only the Authoritative Server change is not enough, support
> on the recursive server is also very important .
> because the resolver determines the reponse to clients.
This is true. A typical resolver will serve around 50,000 to 2,000,000
users (although this is rare). This means that for 60 seconds, you shift
around 'a hundred thousand' potential users.
In practice, this appears to be good enough from what I hear.
Or let me put it another way, before we burden the DNS protocol with another
record type we have to add downgrade/workaround/DNSSEC support for, we
should have numbers that say it solves a problem.
CDNs could maybe chime in.
Bert
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