Now that tcpdump has been installed on your system, let's explore the different options and functionalities it offers. This should install the tcpdump utility and solve the "command not found" error. Note that if you're asked to install libcap, type in Yes or Y as it is a core dependency, without which tcpdump will refuse to start up. To install the tcpdump utility on Fedora, CentOS, and RHEL, issue the following command: sudo dnf install tcpdump On Arch-based systems, run: sudo pacman -S tcpdump On Debian/Ubuntu derivatives, run: sudo apt- get install tcpdump To install tcpdump, fire up the terminal and run the command corresponding to the Linux distro that you're currently using: A capture filter takes the form of a series of primitive expressions connected by conjunctions ( and/or) and optionally preceded by not: not primitive andor not primitive. Step 4: Capture RDP traffic between the RDP server and Windows client. You enter the capture filter into the Filter field of the Wireshark Capture Options dialog box, as shown in Figure 4.3, The Capture Options input tab. Step 3: Obtain the RDP servers private encryption key. Step 2: Remove forward secrecy ciphers from the RDP client. In case you are unable to run the tcpdump command and are stuck at the " tcpdump: command not found" error, let's learn how to install tcpdump on your Linux machine. Step 1: Set up a virtual environment with two hosts, one acting as an RDP client and one acting as an RDP server. So you should be able to use it right away by typing in tcpdump with a sudo prefix. Tcpdump usually comes pre-installed with all mainstream Linux distributions and security-based alternatives.
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