private void
applyEDNS(Message query) {
	if (queryOPT == null || query.getOPT() != null)
		return;
	query.addRecord(queryOPT, Section.ADDITIONAL);
}
Sets the local address to bind to when sending messages.  A random port
will be used.
@param addr The local address to send messages from.
src/main/java/core/org/xbill/DNS/SimpleResolver.java