Explore the challenges of MAC address duplication in LANs and modern cloud environments in this 28-minute conference talk from DevConf.CZ 2023. Delve into the traditional solutions for MAC address management in virtualized networks, and examine their limitations when applied to Kubernetes and cloud-based systems. Learn about kubemacpool, a classic MAC pool manager for KubeVirt, and compare it to a new reactive approach for handling MAC collisions. Gain insights into the pros and cons of existing solutions and discover potential alternatives for addressing MAC address conflicts in contemporary network architectures.