![]() What if you wanted to capture and analyze traffic on a remote server? Wireshark is usually used to analyze traffic on your local network, so you would need to use a tool like tcpdump. Later when you want to revisit the traffic capture, you can go to “File > Open” to import a saved PCAP file. For example, you can monitor all mail traffic, including SMTP, IMAP, IMAP over TLS, POP3, and POP3 over TLS, across multiple hosts and subnets, using a command like this: tcpdump ' (host 10.0.0.1 and net 192.168.1. You might also see the extension “PCAPNG,” which stands for “PCAP Next Generation” and is a new version of the PCAP file format. PCAP stands for “Packet CAPture” and is the file extension used for Wireshark capture files. Then, go to “File > Save” to save the PCAP file. This will tell Wireshark to stop capturing packets. ![]() You can save the captured packets by first clicking on the red square button on the top toolbar: You should see packets listed in the Wireshark window like this: You can double-click on an interface to see traffic details: ![]() To see what they are, simply enter the command wireshark -h and the help information shown in Example 10.1, Help information available from Wireshark (or something similar) should be printed. Wireshark supports a large number of command line parameters. Working With PCAP FilesĪfter you open up Wireshark, it will start capturing traffic on multiple network interfaces. In this section we will look at starting it from the command line. Since we will go through some examples, feel free to use a PCAP file to follow along! Head to the Wireshark wiki to find some sample capture files. ![]() In this article, we will go through some basics of capturing traffic with Wireshark. You can use it to diagnose network issues and find network vulnerabilities. Wireshark supports a large number of command line parameters. It lets you dive into captured traffic and analyze what is going on within a network. Wireshark is the world’s most popular network protocol analyzer. If you are a computer network or security enthusiast, you’ve probably heard of Wireshark. How to use Wireshark to capture network traffic.
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