ip_mreqn(2type)                                                ip_mreqn(2type)

NAME
       ip_mreqn, ip_mreq - IP multicast request index

LIBRARY
       Standard C library (libc)

SYNOPSIS
       #include <netinet/in.h>  /* Definition of IP* constants */

       struct ip_mreqn {
           struct in_addr  imr_multiaddr;  /* IP multicast group address */
           struct in_addr  imr_address;    /* IP address of local interface */
           int             imr_ifindex;    /* interface index */
       };

       struct ip_mreq {
           struct in_addr  imr_multiaddr;  /* IP multicast group address */
           struct in_addr  imr_address;    /* IP address of local interface */
       };

DESCRIPTION
       .imr_multiaddr
              The address of the multicast group the application wants to join
              or leave.  It must be a valid multicast address.

       .imr_address
              The address of the local interface with which the system should
              join the multicast group; if it is equal to INADDR_ANY, an
              appropriate interface is chosen by the system.

       .imr_ifindex
              The interface index of the interface that should join/leave the
              .imr_multiaddr group, or 0 to indicate any interface.

HISTORY
       ip_mreqn
              Linux 2.2.

       ip_mreq
              Linux 1.2.

SEE ALSO
       IP_ADD_MEMBERSHIP(2const), IP_DROP_MEMBERSHIP(2const),
       IP_MULTICAST_IF(2const), ip(7)

Linux man-pages 6.17              2025-11-25                   ip_mreqn(2type)