Cloudflare: BGP Anycast, eBPF DDoS Mitigation & Pingora Rust Proxy
Protecting and accelerating 20%+ of the global web: BGP Anycast routing, eBPF & XDP Layer-4 line-rate DDoS absorption, and Pingora Rust proxying.
Cloudflare advertises identical IP prefixes from 330+ cities worldwide using BGP Anycast. Traffic is automatically steered to the topologically closest data center, converting volumetric DDoS attacks from a single focal point into hundreds of manageable local streams.
BGP Anycast & eBPF XDP DDoS Filtering
Over 60 million HTTP requests/sec and multi-Tbps attack absorptionAbsorbing multi-terabit volumetric DDoS attacks without exhausting edge server socket queues or operating system network stacks.
BGP Anycast distributes attack traffic across hundreds of edge cities. eBPF programs attached to XDP (eXpress Data Path) inspect and drop malicious packets directly in network card NIC drivers before kernel memory allocation.
BGP route flapping can cause TCP connection resets if routes shift mid-stream; requires Anycast TCP synchronization techniques.
Differentiate Layer-7 DDoS protection (rate limiting, CAPTCHAs) from Layer-4 network DDoS protection (eBPF XDP SYN-cookie dropping at line rate).
DNS Resolution & Anycast Routing
Demystify the phonebook of the internet, covering hierarchical tree lookups, root nameservers, TLDs, authoritative servers, TTL caching, and Anycast routing.
TLS Certificate Management at Scale: ACME & Let's Encrypt
Automate public key infrastructure: The ACME protocol (RFC 8555), HTTP-01 vs DNS-01 validation challenges, Let's Encrypt 90-day rotation cycles, Kubernetes cert-manager orchestration, OCSP Stapling, and Certificate Transparency logs.
DDoS Protection: Layer 3/4 vs Layer 7 Attacks
Mitigate massive distributed denial-of-service floods: Layer 3/4 volumetric SYN floods and UDP reflection amplification vs Layer 7 HTTP application floods and Slowloris, BGP Anycast scrubbing centers, and eBPF/XDP wire-speed packet filtering.
Real-Time Analytics Pipeline Design: ClickHouse & Kafka
Architect high-throughput, sub-second analytical streaming pipelines: Apache Kafka event ingestion, ClickHouse MergeTree storage engines, streaming Materialized Views, SIMD vectorization, and Kappa architecture.
Cloudflare Blog • 2022
Cloudflare Engineering • 2020
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