Socket option for local interface to use for outgoing multicast packets.

typedef implementation_defined outbound_interface;

Implements the IPPROTO_IP/IP_MULTICAST_IF socket option.

For IPv4, the outbound interface may be specified using an IPv4 address. For IPv6, an interface index must be used, since an IPv6 address does not uniquely identify a network interface.

Examples

Setting the option:

boost::asio::ip::udp::socket socket(my_context);
...
boost::asio::ip::address_v4 local_interface =
  boost::asio::ip::address_v4::from_string("1.2.3.4");
boost::asio::ip::multicast::outbound_interface option(local_interface);
socket.set_option(option);

Requirements

Header: boost/asio/ip/multicast.hpp

Convenience header: boost/asio.hpp