On this page7. Receiving Multicast IP Datagrams7. Receiving Multicast IP Datagrams This section describes the extensions required for receiving multicast IP datagrams. Subsections 7.1 Extensions to the IP Service Interface 7.2 Extensions to the IP Module 7.3 Extensions to the Local Network Service Interface 7.4 Extensions to an Ethernet Local Network Module 7.5 Extensions to Local Network Modules other than Ethernet