Passive Mapping: The Importance of Stimulus – This paper is a follow-on to the first Passive Mapping paper. It examines the difference between active and passive mapping and gives some examples of how this difference can be implemented.
You can download it from the following link: https://packetstormsecurity.com/files/download/22211/PassiveMappingviaStimulus.pdf
Source: https://packetstormsecurity.com/files/22211/PassiveMappingviaStimulus.pdf.html