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: 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. So you should be able to use it right away by typing in tcpdump with a sudo prefix. It is available in deb/ubuntu and I think RHEL derivatives.Tcpdump usually comes pre-installed with all mainstream Linux distributions and security-based alternatives. UPDATE2 OP says TCP and UDP is a requirement. You can also see which ports are opened on a Linux system using the lsof, ss and fuser commands. In the netstat output you can also see the port opened by a specific process. so you could do the above command and get the desired result. The netstat command allows to see the connections from and to our current Linux systems and it provides flags that also show which process a specific connection is related to. d specifies the time interval in between writes. You can do it with nethogs: nethogs -d 1 eth0 > output.txt Up NetHogs and immediately see which PID is causing this, and if it's So if there's suddenly a lot of network traffic, you can fire Width by process - and does not rely on a special kernel module to be Per protocol or per subnet, like most such tools do, it groups band‐ You can also monitor multiple interfaces. However, its output is bandwidth per process, sent and received.

You run it on the network interface, e.g. Debian/ubuntu/etc apt-get install nethogs NetHogs is a opensource tools to monitor network bandwidth that was used by the process and program in linux operating system.

Linux network usage by process