Magic Transit: Network functions at Cloudflare scale

What this post added

This post introduces Magic Transit, a new capability that extends Cloudflare's network functions to operate at the IP layer for any IP traffic. It leverages Cloudflare's existing global network, anycast, and homogeneous server architecture to provide customers with DoS mitigation, firewalling, and routing at the edge. The implementation details highlight the use of network namespaces for isolation and control, and GRE tunneling over anycast for delivering traffic to customer networks, effectively making Cloudflare's edge their own network edge.