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by mike_d 1510 days ago
Yes, network operators (should) participate in centralized black hole services like UTRS[1]. If you can identify the specific IPs that are under attack you make a BGP announcement to other participating networks asking them to drop traffic to that IP within their networks.

As a participant you can avoid paying to send outbound attack traffic, and also identify attack sources within your own network.

1. https://team-cymru.com/community-services/utrs/