More than passive defense
http://www.cerias.purdue.edu/site/blog/post/more_than_passive_defense/ [www.cerias.purdue.edu]
2018-02-22 17:20
Back in the late 1980s and early 1990s, I quietly built some counterhacking and beaconing tools that I installed in a “fake front” machine on our local network. People who tried to break into it might get surprises and leave me log info about what they were up to, and things they downloaded would not do what they thought or might beacon me to indicate where the code went. This was long before honeypots were formalized, and before firewalls were in common use.
This a very good and interesting read.
source: grugq