Method setOpcode

src/main/java/core/org/xbill/DNS/Header.java:198–205

Sets the message's opcode @see Opcode

(int value)

 * @see Opcode
 */
public void
setOpcode(int value) {
	if (value < 0 || value > 0xF)
		throw new IllegalArgumentException("DNS Opcode " + value +
						   "is out of range");
	flags &= 0x87FF;
	flags |= (value << 11);
}

/**
 * Retrieves the mesasge's opcode