private void
verifyTSIG(Message query, Message response, byte [] b, TSIG tsig) {
	if (tsig == null)
		return;
	int error = tsig.verify(response, b, query.getTSIG());
	if (Options.check("verbose"))
		System.err.println("TSIG verify: " + Rcode.TSIGstring(error));
}
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