What are the linux packet capture tools?

Linux packet capture tools: 1. Charles, by becoming a proxy for a computer or browser, intercepts requests and request results to analyze the packet capture; 2. Wireshark, a cross-platform packet capture tool; 3 , tcpdump, a network data collection and analysis tool that can capture data and analyze it; 4. Netstat, etc.

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

The main function of the network packet capture tool is to record the network execution process in detail. If you are a programmer, you must have a certain understanding of network packet capture. When there is a problem with the network communication part of the program you wrote, you can generally quickly locate the cause of the program problem by grabbing the package.

linux packet capture tool

1. Charles

Charles is actually a proxy server , by becoming a proxy for a computer or browser, and then intercepting requests and request results to achieve the purpose of analyzing packet captures. The software is written in Java and can be used on Windows, Mac, and Linux. You should all develop iOS on a Mac system. When installing Charles, you need to install the Java environment first.

2. Wireshark

Wireshark is a super powerful packet capture tool. It is a must-use tool for network engineers and is also a must-have tool for network engineers. This cross-platform tool can be used on Windows, Linux, and macOS. It can not only analyze http/https data, but it can also analyze network layer 2 and above, which can be seen, such as the three-way handshake of tcp, etc. However, if you only analyze the http protocol, you do not need such a professional tool to avoid increasing the cost of filtering requests. And learning cost

3. tcpdump

tcpdump is a commonly used packet capture tool under Linux. It is a command line tool. It can capture data similar to Wireshark, and the saved data packets can be put into Wireshark for analysis. If your Linux server needs to capture packets to analyze problems, it is a very good choice.

TcpDump is a network data collection and analysis tool. Using TcpDump, you can completely intercept the "header" of the data packets transmitted in the network and provide analysis. It also supports filtering for network layer, protocol, host, network or port. , often used to intercept network packets and output the packet contents.

4. Netstat

Netstat is a tool for monitoring TCP/IP networks. The tool can display routing tables, actual Network connection and status information of each network interface device are generally used to check the network connection of each port of the machine.

5. ngrep

ngrep is a network packet capture tool that can be used to listen to the inflow and outflow of data on each port. Let's take a look at how the man manual introduces ngrep:

DESCRIPTION
ngrep strives to provide most of GNU grep's common features, applying them to the network layer.  ngrep is a pcap-aware tool
that  will allow you to specify extended regular expressions to match against data payloads of packets.  It currently recog‐
nizes TCP, UDP and ICMP across Ethernet, PPP, SLIP, FDDI and null interfaces, and understands bpf filter logic in  the  same
fashion as more common packet sniffing tools.

About meaning:

ngrep strives to provide most of the common functions of GNU grep and apply them to the network layer. ngrep is a pcap-aware tool that lets you specify an extended regular expression to match a packet's data payload. Currently it recognizes TCP, UDP and ICMP on Ethernet, PPP, SLIP, FDDI and null interfaces and understands bpf filter logic in the same way as more common packet sniffing tools

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