How Cloudflare blocked a monumental 7.3 Tbps DDoS attack

A DDoS gets some fraction of the entire internet to attack a single host.

As the internet gets more users and more devices connected, the ratio of DDoS volume to a single connections volume will only get larger.

Is there any kind of solution?

Not a 100% solution but would help greatly if ISPs:

1) performed egress filtering to prevent spoofing arbitrary source addresses

2) temporarily shut off customers that are sending a large volume of malicious traffic

> sending a large volume of malicious traffic

How would an ISP determine egress is malicious? Genuinely curious.

Hundreds of Gbps of UDP traffic to random ports of a single destination IP from residental (?) network should be pretty easy pattern to automatically detect and throttle.

More advanced attacks are more tricky to detect, but plain dumb UDP flood should be easily detectable.

> Hundreds of Gbps of UDP traffic to random ports of a single destination IP from residental (?) network

You mean my legitimate QUIC file transfer?

Have you ever uploaded 100's of Gbps over QUIC from your residential connection to a single IP?

And the aggregate across the ISP's network could in theory be monitored - so if you were uploading 1Gbps, yes, it could be legitimate. If you and 582 others were all uploading 1Gbps to the same IP at the same time, much less likely legitimate.