Wireshark is legal to use, but it can become illegal if cybersecurity professionals attempt to monitor a network that they do not have explicit authorization to monitor. If DNS packets aren't presented, you can try getting domain name of site by using its address in reverse DNS lookup request. Stories abound of network administrators capturing usernames, passwords, email addresses, and other sensitive user data. Wireshark should be able to automatically show domain name instead of IP addresses for traces with DNS traffic, check resolve network addresses option. Most of the Wireshark menu has the standard File, Edit, View, and Capture options. Wireshark can run on Windows and Linux machines. After downloading and installing Wireshark, you can launch it and double-click the name of a network interface under Capture to start capturing packets on that interface. Wireshark has predefined coloring rules in the Edit menu under Preferences. You could think of a network packet analyzer as a measuring device for examining what’s happening inside a network cable, just like an electrician uses a voltmeter for examining what’s happening inside an electric cable (but at a higher level, of course). Wireshark uses display filters to concentrate on interesting packets while hiding the boring ones. A network packet analyzer presents captured packet data in as much detail as possible. Wireshark shows packet details captured from different network media, breaking down the Open Systems Interconnection model into the data link, network, transport, and application layers. Wireshark is a powerful tool and technically can be used for eavesdropping. Sometimes Wireshark is called a network analyzer or a sniffer. Wireshark is an open-source tool used for capturing network traffic and analyzing packets at an extremely granular level.
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