Explore the intricacies of socket data transfer in Linux systems through this informative conference talk. Dive into the world of network proxies and learn about alternative methods for moving data between sockets. Discover the sockmap API, which leverages eBPF technology, and understand its role in transparent L7 filtering and socket-level policy enforcement in Cilium. Gain insights into the fundamentals, evolution, and features of the sockmap API, as well as its internal design. Examine the existing caveats and limitations of this technology. By the end of the talk, acquire a comprehensive understanding of the sockmap API's implementation and its significance in Kubernetes clusters using Cilium.