An Ethernet protocol data unit (PDU) over 5G service is provided. A network device in a core network stores addresses of advertised subnets, associated with multiple user equipment or customer premises equipment (UE/CPE) devices, in a subnet table that correlates a MAC address of each of the multiple UE/CPE devices to a subnet address. The network device receives an allocation and retention priority (ARP) request over a data link layer. The ARP request indicates an IP address for a target host of a data flow. The network device determines, based on the subnet table and the IP address, a MAC address of one UE/CPE device servicing the host address. The network device sends a directed ARP request to the UE/CPE device using the MAC address, receives in response a target MAC address for the target host, and sends a response to the ARP request with the target MAC address.