Capturing Network Traffic Over Cilium VTEP Tunnels with eBPF: A Practical Guide
In modern Kubernetes environments, connecting external systems—like virtual machines, legacy appliances, or third-party load balancers—to pods often requires overlay tunneling. Cilium’s VTEP (VXLAN Tunnel Endpoint) integration makes this seamless by allowing direct VXLAN communication between Cilium-managed pods and external VTEP devices. But how do you actually observe and debug the traffic flowing through these tunnels…
