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npcap practical package grabbing tutorial

Popularity：336 ℃/2025-02-14 21:38:56

npcapIt is a network packet capture library for Windows systems. It is based on an improved version of WinPcap and supports the latest Windows features and protocols (such as IPv6). It usually hasWiresharkorNmapTools such as this are used together for the capture and analysis of network data packets.

If you want to usenpcapTo carry out actual combat packet capture, the following are the specific steps:

1. Install Npcap

  1. Visit Npcap's official GitHub page or official website to download and install package:
    • GitHub: /nmap/npcap
    • Official website:/
  2. Download the installation package that suits your system (usually.exedocument).
  3. Run the installer and follow the prompts to complete the installation.
    • During installation, make sure to check“Install Npcap in WinPcap API-compatible Mode”, to be compatible with WinPcap-based tools.
    • If you need to support loopback interface packet capture (crawl local loopback traffic), you can check it“Support loopback traffic”。

2. Use Wireshark to capture packets

Wireshark is a powerful network protocol analysis tool that supports Npcap as its packet capture engine.

  1. Install Wireshark：

    • Visit Wireshark's official website:/
    • Download and install Wireshark. During the installation process, Wireshark will automatically detect and bind Npcap.

  2. Start Wireshark and select the network card：

    • Open Wireshark and all available network interfaces are listed in the main interface.
    • Select the network interface (for example, Ethernet or Wi-Fi) you want to capture packets.

  3. Start catching bags：

    • Click the "Start" button and Wireshark will start capturing all network traffic on the interface.
    • You can use filters (e.g. == 80) to capture only traffic for a specific protocol.

  4. Analyze data packets：

    • Wireshark will display captured data packets in real time, including source address, destination address, protocol type and other information.
    • Click on a data packet to view its detailed content (such as TCP/IP header, application layer data, etc.).

3. Use Nmap to capture packets

Nmap is a network scanning tool that can be used for packet capture and network detection in combination with Npcap.

  1. Install Nmap：

    • Visit Nmap's official website:/
    • Download and install Nmap.

  2. Use Nmap to grab packets：

    • Open a command prompt or PowerShell.
    • Use the following command to capture the packet:
      nmap --packet-trace -p 80
      This command will scanport 80 and displays the crawled packet information.

4. Use RawCap to grab loopback traffic

If you need to crawl the local loopback interface (127.0.0.1) traffic can be usedRawCaptool.

  1. Download RawCap：

    • Visit RawCap official website:/?page=RawCap
    • Download and unzip RawCap.

  2. Crawl loop backflow：

    • Open a command prompt and navigate to the directory where RawCap is located.
    • Run the following command:
       127.0.0.1
      This saves the loopback interface traffic toin the file.

  3. Using Wireshark to analyze：

    • Open Wireshark and loadFiles can analyze loopback traffic.

5. Use Python and Scapy to capture packages

If you prefer programming, you can use Python'sScapyThe library carries out packet capture.

  1. Install Scapy：

    • Install Scapy using pip:
      pip install scapy

  2. Write a packet capture script：

    • Create a Python script, e.g.：
      from import sniff

 def packet_callback(packet):
     print(())

 # Start grabbing
 sniff(prn=packet_callback, count=10) # Crawl 10 packets

  3. Run the script：

    • Run the script on the command line:
      python

6. Frequently Asked Questions

  • Permissions issues：
    • Administrator permission is required to capture packages. Make sure to run Wireshark, Nmap, or other tools as an administrator.
  • Unable to crawl loopback traffic：
    • Make sure that Npcap is checked when installing“Support loopback traffic”, or use the RawCap tool.
  • Too large packet capture file：
    • Use filters (e.g. == 80) to reduce unnecessary packets.

Through the above methods, you can use Npcap to capture packets in actual combat and select the appropriate tools for analysis according to your needs.

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