public MulticastReceiverConfigurationImpl(String group,int port) throws UnknownHostException {
  this(InetAddress.getByName(group),port,640);
}

public MulticastReceiverConfigurationImpl ( String group , int port ) throws UnknownHostException { this ( InetAddress . getByName ( group ) , port , 640 ) ; }
defaults to maximum datagram size of 640 bytes ( 512 per uda 1 . 0 , 128 byte header ) .
