The standard network protocol analyser
Wireshark captures network traffic and lets you inspect it packet by packet, decoding hundreds of protocols. Network engineers and security professionals use it to troubleshoot connection problems and understand what is happening on a network.
It is free and open source. Reading the results takes networking knowledge, and you should only capture traffic on networks you are authorised to monitor.
Pros
- Decodes hundreds of protocols
- Powerful filters
- Free and open source
Cons
- Needs networking knowledge