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Cloudflare blocks largest recorded DDoS attack peaking at 3.8Tbps
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
That’s still 2.5k fully saturated 400mbps connections. As far as I know this kind of approach wouldn’t work since you’d easily block them - you need craploads of bots all around the world for this to not be defeated by a smart firewall.