@@ -357,7 +357,6 @@ and retrieve the MTU by calling
It is possible to implement RFC 4821 MTU probing with
@@ -383,6 +382,15 @@ When an invalid socket option is passed,
+.BR IP_MULTICAST_ALL " (since Linux 2.6.30)"
+Sets the multicast delivery policy to the socket. Argument is a boolean
+integer that enables or disables multicast delivery from all groups.
+If not set, delivery to the socket is restricted to data from those multicast
+groups that have been explicitly subscribed to via a multicast join operation
+for this socket. The default is 1 which means that a socket which is bound
+to the wildcard address (INADDR_ANY) will receive multicast packets from all
+groups that have been subscribed to on this system.
.BR IP_MULTICAST_LOOP " (since Linux 1.2)"
Sets or reads a boolean integer argument that determines whether
sent multicast packets should be looped back to the local sockets.