Sniffers are the most dreaded nightmare of system administrators.
A compromised system is bad enough, but a compromised system with a sniffer installed on it, stealing company secrets and important passwords is as bad as it gets. In this manual we will discuss just how sniffers work and how to detect them and a lot more related information. Sniffers were originally developed by programmers around the world to be used as a tool for debugging network problems. In simple words, what they do is capture, interpret and save for analysis all the packets being sent across the network. Think of sniffers as recorders that capture or record all the packets being sent over a network.