Npcap is a packet capture and injection library for Windows by the Nmap Project. It is a complete update to the unmaintained WinPcap project with improved speed, reliability, and security.
The complete documentation for Npcap is available in the Npcap Guide on npcap.com. There you will find information about installation, reporting bugs, developing software with Npcap, and Npcap internals.
The latest installer, Software Development Kit (SDK), source, and debug symbols can be downloaded from https://npcap.com/#download
Please report any bugs or issues about Npcap at: Npcap issues on GitHub. In your report, please provide your DiagReport output, user software version (e.g. Nmap, Wireshark), reproduce steps and other information you think necessary. Refer to the Npcap Guide section on reporting bugs for more complete directions.
If you want to contribute to the development of this project, first you need to setup the development environment.
Install a Windows. For example, use Windows 11, version 21H2.
When you install Visual Studio 2022, select the Desktop development with C++ workload, then under Individual Components add:
- MSVC v143 - VS 2022 C++ ARM64/ARM64EC Spectre-mitigated libs (Latest)
- MSVC v143 - VS 2022 C++ x64/x86 Spectre-mitigated libs (Latest)
- C++ ATL for latest v143 build tools with Spectre Mitigations (ARM64/ARM64EC)
- C++ ATL for latest v143 build tools with Spectre Mitigations (x86 & x64)
- C++ MFC for latest v143 build tools with Spectre Mitigations (ARM64/ARM64EC)
- C++ MFC for latest v143 build tools with Spectre Mitigations (x86 & x64)
- Windows Driver Kit
Install Windows SDK from https://developer.microsoft.com/en-us/windows/downloads/windows-sdk/ if you get the error "The Windows SDK version 10.0.26100.0 was not found.".
You also need WDK for Windows 11, version 21H2. Download and install it from https://go.microsoft.com/fwlink/?linkid=2166289
For addition tasks, like building the documentation, you need roffit. Clone it from
cd C:\Users\Measurement\
git clone https://github.com/bagder/roffit.git
Also, download 7z from https://www.7-zip.org/a/7z2409-x64.exe
As this version of Visual Studio does not support the compilation for Win32 drivers out of the box, please follow the instructions given in https://stackoverflow.com/questions/75509242/compiling-32-bits-driver-using-msvc-2022 In addition, you might need additional files (TODO).
Next, download AirPCAP Devpack from https://support.riverbed.com/bin/support/download?sid=l3vk3eu649usgu3rj60uncjqqu and unpack it to, for example to %USERPROFILE%\Airpcap_Devpack
Then, download https://npcap.com/dist/ npcap-sdk and install it under, e.g. %USERPROFILE%\npcap-sdk-1.14
We need Winflex, which can be download at https://github.com/lexxmark/winflexbison/releases . Be sure that it is in environment variable 'Path'. Test it by entering 'win_flex -V' into a command shell.
You might also need pkg-config from https://download.gnome.org/binaries/win32/dependencies/pkg-config_0.26-1_win32.zip
On https://github.com, fork both the repositories npcap https://github.com/nmap/npcap and libpcap https://github.com/the-tcpdump-group/libpcap. Then, enter the following commands.
cd %USERPROFILE%
git clone https://github.com/YOURUSER/npcap
git submodule update --init --recursive
cd wpcap
wpcap-cmake.bat
cd ..
cd installer
build.bat
The Npcap License allows end users to download, install, and use Npcap from our site for free on up to 5 systems (including commercial usage). Software providers (open source or otherwise) which want to use Npcap functionality are welcome to point their users to npcap.com for those users to download and install.
We fund the Npcap project by selling Npcap OEM. This special version of Npcap includes enterprise features such as the silent installer and commercial support as well as special license rights.
dev@nmap.org(Nmap development list, for technical issues and discussion)sales@nmap.com(Sales addr 5D46 ess for commercial/licensing issues)- Npcap Issues Tracker