At Modal, we built a high-availability, Go-based VPN proxy called vprox. This is a deployment of WireGuard, so it operates on Layer 3 (IP) of the network stack and allows us to funnel outbound traffic from containers around the world through static IPv4 addresses. In the event of a single-node failure, its static IPs are associated with other proxy nodes, and containers reconnect within seconds. This blog post is about the guts of our network infrastructure, which powers Static IP Proxies. Sc...