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Questions tagged [npcap]

Npcap is the packet sniffing/transmitting library for Windows produced by the Nmap project. It is based on the discontinued WinPcap library, but with improved speed, portability, security, and efficiency. It is the de facto standard link-layer network access in Windows environments.

Npcap is the packet sniffing/transmitting library for Windows produced by the Nmap project. It is based on the discontinued WinPcap library, but with improved speed, portability, security, and efficiency. It is the de facto standard for link-layer network access in Windows environments.

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42 questions
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Unable to Load DLL 'wpcap.dll'. The specified module is not found

I want to know which application installed this wpcap.dll. I can see it in some PCs in location c:\Windows\System32\Npcap and in others in c:\Windows\System32. When I run my code (which has DllImport("wpcap.dll") ) in the first PC, this exception is…
Cherylaksh
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Installing Net::Pcap using strawberry perl on windows 10

I am trying to install Net::Pcap (https://metacpan.org/pod/Net::Pcap) using edition of portable strawberry Perl v5.28.1 ,below are my steps : 1.I installed npcap (winpcap for windows 10 ) from https://nmap.org/npcap/#download 2.I downloaded the…
jsor
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How do libraries like Scapy, Npcap, WinPcap, etc., get around Window's limitations on sending raw TCP packets?

I learned the hard way that modern Windows machines do not permit sending TCP data over raw sockets after trying to perform the TCP handshake myself in Python. And yet Scapy, a Python library, is able to do it seemingly just fine. Other libraries,…
noG23
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Npcap Async Sniffer

I'm using scapy to make ansyncronous sniffer throught an usb-ethernet adapter. from scapy.all import * t = AsyncSniffer(iface="ASIX AX88772B USB2.0 to Fast Ethernet Adapter",filter="ether proto 0x5337") t.start() print("hey") time.sleep(10)…
martinmistere
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what is the optimize argument in pcap_compile( , , , int optimize, ) in npcap library?

pcap_compile(pcap, &fcode, "tcp", 0, PCAP_NETMASK_UNKNOWN) Here I have set to 0 and it is working, but I want to know what it does. I am trying to filter tcp packets in a pcap file. And does pcap_setfilter() reconstructs pcap file into a given…
Nikhil Pradhan
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Unable to activate the adapter by using Npcap instead of Winpcap

I am trying to use Sharppcap in order to pack and send UDP packages. I am able to send packages by Windows Loopback Adapter but it limits the byte length to 1500. However, I need to send larger packages in order to be faster. I installed Npcap to…
Learner
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Windows userspace TCP/IP stack - How to suppress the kernel stack for a specified ethernet interface?

I have a TCP/IP stack running within a Windows userspace program. The stack is based on a Windows-port of LwIP: https://github.com/yarrick/lwip-contrib/tree/master/ports/win32 The userspace stack interfaces with an ethernet interface at layer 2…
Mike76
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NPCap and Windows 10

I am trying to capture traffic to 127.0.0.1 on a Windows 10 computer with Wireshark. I have installed NPCap but it does not appear to be capturing that tr5affic. Looking at the interface options in Wireshark for the loopback adapter I see it has…
Sid
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Using WireShark to check WCF TCP Server and Client traffic on localhost

I've created a simple TCP client and TCP server in Visual Studio using WCF. I have one simple operation on the server that receives an integer, increments it and sends it back. It works as expected. I would like to use Wireshark to monitor traffic…
Simon Bosley
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How to enable 802.11 monitor mode (DOT11_OPERATION_MODE_NETWORK_MONITOR) in a NDIS 6 filter driver?

I have ported WinPcap to a NDIS 6 filter driver: https://github.com/nmap/npcap. But it still doesn't support capturing all 802.11 native packets (like control and management frames are not captured). I noticed there is a way setting…
hsluoyz
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unable to install npcap: failed to create the npcap service: 0x80070005

I am having an error with installing npcap 1.6 with my window 10 laptop. As suggested, I tried to reinstall the installer (1.6) many times but none worked. Here was what I had: How can I fix this error? Thank you, Huy Nguyen.
Nguyen Huy
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How to use npcap in VSCode

I am trying to use npcap SDK in VScode on Windows 10 computer. I've written the correct path to Include directory and Lib directory of the SDK in file c_cpp_properties.json and proper command in file tasks.json. But when I ran my test.c file, it…
pimentaw
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How do you install NPCap library into Visual Studio

I am trying to install the NPCap library into Visual Studio so I can run this code from the documentation. #include "pcap.h" main() { pcap_if_t* alldevs; pcap_if_t* d; int i = 0; char errbuf[PCAP_ERRBUF_SIZE]; /* Retrieve the device list from the…
Lyra Orwell
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PCAP_OPENFLAG_NOCAPTURE_LOCAL not working on windows 10

I want to bridge two adapters on Windows 10 using WinPcap/npcap library. Even after setting the flag PCAP_OPENFLAG_NOCAPTURE_LOCAL, I'm still receiving packets indefinitely (packets sent by Adapter A are sent to Adapter B and vice versa, in a…
graypacket
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TCP SYN sent with Scapy never received by server nor noticed by Wireshark on the loopback interface

I have a problem with a very basic usage of Scapy on Windows 7 (Python 3.6, Scapy 2.4.0). I'm also running Npcap 0.99r7 and Wireshark 2.6.2 on this sytem. The system does only have one wireless network interface plus the Npcap loopback interface. I…
StashOfCode
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