On Wednesday 10 November 2021 at 07:49 UTC, a GRE flood targeted a video streaming customer in Latin America. The attack peaked at 348.6 Gbps and lasted 111 minutes. Traffic originated from 459 autonomous systems in 30 countries, predominantly mobile carrier ranges.
| Vector | GRE flood |
| Peak | 348.6 Gbps |
| Duration | 111 min |
| Time to mitigation | 0.191 s |
| Attack traffic reaching origin | 0.080% |
| Legitimate traffic challenged | 0.75% |
Timeline
The attack was preceded by a publicly announced sales event. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 18 points of presence.
What the customer saw
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Enable authenticated origin pulls.
- Enable log streaming to your SIEM for faster correlation.
- Lower challenge thresholds on authentication endpoints during high-risk events.