Add Multicast capabilities for LAN server scanning.

code/server/sv_init.c

@@ -286,6 +286,9 @@ void SV_Startup( void ) {
 	}
 
 	Cvar_Set( "sv_running", "1" );
+	
+	// Join the ipv6 multicast group now that a map is running so clients can scan for us on the local network.
+	NET_JoinMulticast6();
 }
 
 
@@ -734,6 +737,8 @@ void SV_Shutdown( char *finalmsg ) {
 
 	Com_Printf( "----- Server Shutdown (%s) -----\n", finalmsg );
 
+	NET_LeaveMulticast6();
+
 	if ( svs.clients && !com_errorEntered ) {
 		SV_FinalMessage( finalmsg );
 	}