pgm_socket_multicast_loop.patch

diff --git a/src/pgm_socket.cpp b/src/pgm_socket.cpp
index 7925c6e..fc26161 100644
--- a/src/pgm_socket.cpp
+++ b/src/pgm_socket.cpp
@@ -325,7 +325,7 @@ int zmq::pgm_socket_t::init (bool udp_encapsulation_, const char *network_)
     //  Set IP level parameters.
     {
 		// Multicast loopback disabled by default
-		const int multicast_loop = 0;
+		const int multicast_loop = 1;
 		if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_MULTICAST_LOOP,
 		      &multicast_loop, sizeof (multicast_loop)))
 		    goto err_abort;