In an embodiment, a computer-implemented method for enabling enhanced firewall rules via ARP-based annotations is described. In an embodiment, a method comprises detecting, by a hypervisor implemented in a first host, that a first process is executing on the first host. The hypervisor determines first context information for the first process, generates a first request, encapsulates the first request and the first context information in a first packet, and transmits the first packet to a central controller to cause the central controller to update the controller's table to indicate that the first process is executing on the first host. In response to receiving a second packet from the central controller and determining that the second packet comprises a first response, the hypervisor extracts second context information from the second packet and, based on the second context information, determines that a second process is executing on a second host.