Multicast messages

Multicast messages can be sent and received if you use datagram sockets.

In the AF_INET address family, the transfer of multicast messages is supported by the following socket options of the IPPROTO_IP protocol level:

• IP_ADD_MEMBERSHIP: join a multicast group

• IP_DROP_MEMBERSHIP: leave multicast group

• IP_MULTICAST_IF: display or define the interface for multicast message receipt

• IP_MULTICAST_TTL: display or define the multicast hop limit

In the AF_INET6 address family, the transfer of multicast messages is supported by the following socket options of the IPPROTO_IP protocol level:

• IPV6_ADD_MEMBERSHIP: join a multicast group

• IPV6_DROP_MEMBERSHIP: leave multicast group
• IPV6_MULTICAST_IF: display or define the interface for multicast message receipt
• IPV6_MULTICAST_HOPS: display or define the multicast hop limit