Europe shrugs off largest DDoS attack yet, traffic tops 400Gbps
"Very big NTP reflection attack hitting us right now. Appears to be bigger than the #Spamhaus attack from last year. Mitigating," tweeted Cloudflare's CEO Matthew Price. "Someone's got a big, new cannon. Start of ugly things to come."
The attack used a well-known flaw in the Network Time Protocol (NTP) that's used to set the clocks of servers connecting online. The User Datagram Protocol (UDP)-based protocol can be subverted using a synchronization request so that a target system spews out a large volume of data that can be used in a DDoS attack.
You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump