The goal of this guide is to provide a reliable and fast way for creating a lan tap for red team assessments of networks. While this was the authors’ main target this tap is also quite helpful if you want to have a great device for your daily analysis of network attached computers. Before they started with their implementation they made a list of things which were mandatory. The hardware had to be small, have at least two lan ports and wifi, cheap and opensource included or available.
You can download it from the following link: https://packetstormsecurity.com/files/download/140632/topnsniff.txt
Source: https://packetstormsecurity.com/files/140632/Top-N-Sniff.html