Enforcing and routing based on network-wide policies remains a crucial challenge in the operation of large-scale enterprise and datacenter networks. As current dataplane devices solely rely on layer 2 - layer 4 identifiers to make forwarding decisions, there is no notion of the exact origin of a packet in terms of the sending user or process. In this paper we ask the question: Can we go beyond the MAC? That is, can fine-grained process-level information like user ids, process ids or a cryptographic hash of the sending executable be semantically used to make forwarding decisions within the network? Toward this goal, we present a system enabling such capabilities without the need for modification in applications or the operating system's networking stack. We implemented an early prototype leveraging the P4 technology for protocol-independent packet processing and forwarding in conjunction with on-board tools of the Linux operating system. We finally evaluate our system with regards to practicability and discuss the performance-behavior of our implementation.

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