In 1999 I used the term “third party” to describe the effect of “backscatter” on the Internet, thereby consigning some vague party to some vague corner effects of the Internet. The story featured a posting at the Internet Storm Center titled Deformed Packets Got Packets? Deformed packets are sending SYN ACK packets to the obfuscated IP address 129.250.128.12821. The packets are replying to the IP address they are sending because it is replying with SYNACK.”]
Source: https://taosecurity.blogspot.com/2007/03/nothing-to-see-here.html