Wireshark is the world's most popular network analyzer tool with over 1 million downloads per month. As the Founder of Wireshark University, Laura Chappell is undoubtedly one of the best Wireshark instructors around.
Once you have opened the wireshark, you have to first select a particular network interface of your machine. In most of the cases the machine is connected to only one network interface but in case there are multiple, then select the interface on which you want to monitor the traffic.
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If you think there's a bug in Wireshark's DHCP dissector, either file the bug on the Wireshark Bugzilla or send mail to the wireshark-users mailing list; this is not the place for reporting Wireshark bugs. -Guy Harris 1e1e36bf2d