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Course Introduction：tcpdump is a very commonly used network packet analysis tool that can be used to display TCP/IP and other network data packets transmitted to the system through the network. tcpdump uses the libpcap library to capture network packets. This library is available in almost all Linux/Unix. tcpdump can read the contents from the network card or a previously created packet file, or it can write the packets to a file for subsequent use. You must be root or use sudo privileges to run tcpdump. In this article, we will demonstrate how to use the tcpdump command through some examples, but first let us take a look at how to install tcpdump in various Linux operating systems. Install

2024-04-02 comment 0  760

Course Introduction：Contents of this article: 1.1 tcpdump options 1.2 tcpdump expressions 1.3 tcpdump examples tcpdump uses the command line to filter and capture interface data packets, and its rich features are reflected in flexible expressions. tcpdump without any options will capture the first network interface by default, and packet capture will only stop when the tcpdump process is terminated. For example: shell> tcpdump -nn -i eth0 icmp The following is the detailed tcpd

2017-06-23 comment 0  2178