This OS fingerprinting probe tests the target system's assignment of TCP
						sequence numbers. One common way to test TCP Sequence Number generation is
						to send a probe packet to an open port on the target and then compare the
						how the Sequence Number generated by the target relates to the
						Acknowledgement Number in the probe packet. Different operating systems
						assign Sequence Numbers differently, so a fingerprint of the operating
						system can be obtained by categorizing the relationship between the
						acknowledgement number and sequence number as follows:1. The Sequence Number generated by the target is Zero.2. The Sequence Number generated by the target is the same as the
							acknowledgement number in the probe3. The Sequence Number generated by the target is the acknowledgement
							number plus one3. The Sequence Number is any other non-zero number.