It is an essential tool to launch many network tools, that already use package capturing and the filtering by WinPcap. Some examples:
- Network monitors.
- Intruder detection systems.
- Protocol analyzer...
WinPcap includes the API library from Linux for Windows. Its proven efficiency has transformed the application more or less into a standard for the industry, despite being open source and free. It's used in commercial environments and its performance is outstanding. If you still don't have WinPcap you should have a clear idea why you should install it.