Unified Cloud Routing: Building an Anycast-to-Unicast WireGuard Multi-Cloud Ingress Overlay
Unified Cloud Routing: Building an Anycast-to-Unicast WireGuard Multi-Cloud Ingress Overlay Modern multi-cloud deployments face a frustrating paradox. The same architectural decision that buys resilience — spreading workloads across AWS, GCP, and Azure — also fragments your network into three incompatible private addressing schemes, three routing domains, and three sets of cloud-specific transit tools. The default answer from each vendor (Direct Connect, ExpressRoute, Cloud Interconnect) is expensive, rigid, and deepens the very lock-in you were trying to avoid. A better architecture treats the public internet as a dumb on-ramp and uses a BGP Anycast edge combined with an automated WireGuard overlay mesh as the private backbone that ties all three clouds into a single, routable flat network. This article walks through how that architecture works in practice — the routing mechanics, the dynamic orchestration layer, the MTU and asymmetric routing traps, and the security hardening...
