Source? 300gbps would definitely be visible, and I think I remember hearing about something between 60 and 100gbps.
From Cloudflares response [1 - nice graph in blog] ~75Gbps extra traffic was hitting part of their network.
Obliviously there would have been much more traffic floating around and getting dropped by ISPs that have correctly configured their outgoing traffic filters.
Many [not all] ISPs that were affected only have themselves to blame, the 'Internet' didn't slow down - the part that they are responsible for did - and it was their fault....
From Cloudflares response [1 - nice graph in blog] ~75Gbps extra traffic was hitting part of their network.
Obliviously there would have been much more traffic floating around and getting dropped by ISPs that have correctly configured their outgoing traffic filters.
Many [not all] ISPs that were affected only have themselves to blame, the 'Internet' didn't slow down - the part that they are responsible for did - and it was their fault....
1. http://blog.cloudflare.com/the-ddos-that-knocked-spamhaus-of...