IP_MULTICAST_LOOP(2const)                            IP_MULTICAST_LOOP(2const)

NAME
       IP_MULTICAST_LOOP - loop back sent multicast packets to local sockets

LIBRARY
       Standard C library (libc, -lc)

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

       int setsockopt(int sockfd, IPPROTO_IP, IP_MULTICAST_LOOP,
                      const int *enable, sizeof(int));
       int getsockopt(int sockfd, IPPROTO_IP, IP_MULTICAST_LOOP,
                      int *enabled, sizeof(int));

DESCRIPTION
       Set or read a boolean integer argument that determines whether sent
       multicast packets should be looped back to the local sockets.

ERRORS
       See IPPROTO_IP(2const).  See setsockopt(2).  See ip(7).

HISTORY
       Linux 1.2.

SEE ALSO
       IPPROTO_IP(2const), setsockopt(2), ip(7)

Linux man-pages 6.17              2025-11-25         IP_MULTICAST_LOOP(2const)