Скорее всего, ответ можной найти здесь:
http://blog.leeburrows.com/2011/10/p...network-part1/
Если конкретнее:
Код AS3:
private function setupGroup():void
{
//create a GroupSpecifier object
var groupspec:GroupSpecifier = new GroupSpecifier("myGroup");
//enable posting (to entire group)
groupspec.postingEnabled = true;
//allow data to be exchanged on IP multicast sockets
groupspec.ipMulticastMemberUpdatesEnabled = true;
//set the IP adress and port to use
groupspec.addIPMulticastAddress("225.225.0.1:30000");
//create NetGroup with our NetConnection using GroupSpecifier details
group = new NetGroup(netConn, groupspec.groupspecWithAuthorizations());
//listen for result of setup
group.addEventListener(NetStatusEvent.NET_STATUS, netHandler);
}
И дальше слушаем события уже экземпляра GroupSpecifier:
Код AS3:
...
case "NetGroup.Neighbor.Connect":
var peer:Object = new Object();
peer.id = event.info.peerID.toString();
peer.label = truncateString(event.info.peerID);
peerList.addItem(peer);
break;
...