Legacy Document

Important: The information in this document is obsolete and should not be used for new development.

Inside Macintosh: Networking With Open Transport / Part 2 - Open Transport Reference: Chapter 29 - TCP/IP Services Reference / Constants and Data Types

IP Multicast Address Structure
You use the IP multicast address structure with the IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP options when you are adding or dropping membership in an IP multicast address. The IP multicast address structure is defined by the TIPAddMulticast data type.
struct TIPAddMulticast {
   InetHost multicastGroupAddress;
   InetHost interfaceAddress;
};
typedef struct TIPAddMulticast TIPAddMulticast;
Field Description

multicastGroupAddress
The IP address of the multicast group for which you want to add or drop membership.
interfaceAddress
The IP address of the network interface that you are using for the multicast group.