ASPA: making Internet routing more secure
2026-02-27
ASPA is the cryptographic upgrade for BGP that helps prevent route leaks by verifying the path network traffic takes. New features in Cloudflare Radar make tracking its adoption easy....
Route leak incident on January 22, 2026
2026-01-23
An automated routing policy configuration error caused us to leak some Border Gateway Protocol prefixes unintentionally from a router at our Miami data center. We discuss the impact and the changes we are implementing as a result....
A closer look at a BGP anomaly in Venezuela
2026-01-06
There has been speculation about the cause of a BGP anomaly observed in Venezuela on January 2. We take a look at BGP route leaks, and dive into what the data suggests caused the anomaly in question....
BGP zombies and excessive path hunting
2025-10-31
A BGP “zombie” is essentially a route that has become stuck in the Default-Free Zone (DFZ) of the Internet, potentially due to a missed or lost prefix withdrawal. We’ll walk through some situations where BGP zombies are more likely to rise from the dead and wreak havoc. ...
Monitoring AS-SETs and why they matter
2025-09-26
We will cover some of the reasons why operators need to monitor the AS-SET memberships for their ASN, and now Cloudflare Radar can help. ...
Cloudflare incident on August 21, 2025
2025-08-22
On August 21, 2025, an influx of traffic directed toward clients hosted in AWS us-east-1 caused severe congestion on links between Cloudflare and us-east-1. In this post, we explain the details....
QUIC action: patching a broadcast address amplification vulnerability
2025-02-10
Cloudflare was recently contacted by researchers who discovered a broadcast amplification vulnerability through their QUIC Internet measurement research. We've implemented a mitigation....
Cloudflare’s perspective of the October 30, 2024, OVHcloud outage
2024-10-30
On October 30, 2024, cloud hosting provider OVHcloud (AS16276) suffered a brief but significant outage. Within this post, we review Cloudflare’s perspective on this outage....
The backbone behind Cloudflare’s Connectivity Cloud
2024-08-06
Connectivity CloudAnycastArgo Smart RoutingAthenian ProjectBGPBetter InternetCloudflare NetworkMagic TransitProduct News
Read through the latest milestones and expansions of Cloudflare's global backbone and how it supports our Connectivity Cloud and our services...
Cloudflare 1.1.1.1 incident on June 27, 2024
2024-07-04
On June 27, 2024, a small number of users globally may have noticed that 1.1.1.1 was unreachable or degraded. The root cause was a mix of BGP (Border Gateway Protocol) hijacking and a route leak...