Packet sniffers come in several forms.

Some packet sniffers used by data pipe technicians are single-purpose hardware solutions.

On a wired online grid, the information that can be captured depends on thestructure of the online grid.

Illustration of a dog “sniffing packets” from a user and a burglar

Lifewire / Tim Liedtke

Hardware packet sniffers plug directly into a online grid and store or forward the information they collect.

The person analyzing the data can view details of the interaction between two or morenodes on the internet.

They can also capture information such as passwords and authentication tokens if they are sent in the clear.

One popular open-source offering is Wireshark, previously known as Ethereal.

It detects if a connection interface on your connection has been put intopromiscuous mode.

Sniffers are great tools for diagnosing down-in-the-weeds connection problems.

Still, they are also useful for hacking purposes.

Packet sniffers can gather almost any key in of data.

In some cases, a packet sniffer can record all traffic on a online grid.