diff --git a/packages/node_modules/@node-red/nodes/core/network/32-udp.js b/packages/node_modules/@node-red/nodes/core/network/32-udp.js
index 60e9bec08..894c19d77 100644
--- a/packages/node_modules/@node-red/nodes/core/network/32-udp.js
+++ b/packages/node_modules/@node-red/nodes/core/network/32-udp.js
@@ -180,6 +180,10 @@ module.exports = function(RED) {
         node.tout = setTimeout(function() {
             if (udpInputPortsInUse[p]) {
                 sock = udpInputPortsInUse[p];
+                if (node.multicast != "false") {
+                    sock.setBroadcast(true);
+                    sock.setMulticastLoopback(false);
+                }
                 node.log(RED._("udp.status.re-use",{outport:node.outport,host:node.addr,port:node.port}));
                 if (node.iface) { node.status({text:n.iface+" : "+node.iface}); }
             }