We entered the above command after navigating to in firefox and the screenshot captures the connections established by firefox when reaching the site. Sudo netstat -atupen | grep ESTABLISHED output To do this enter the following command, which is similar to the previous one except that we use -a to view all sockets instead of -l to just view listening sockets. Now let’s take a look at all of the current network connections. The same distinction is true for tcp6/ udp6 when comparing a Local Address of ::(network facing) and ::1(localhost only). For tcp4/ udp4 connections(simply listed as tcp and udp) where the Local Address is listed as 0.0.0.0 the process is listening for connections from any machine that is able to connect to it over the network, whereas when it is listed as 127.0.0.1 it is only listening for connections on the localhost(the machine that it is running on or itself) and cannot be connected to by other computers on the network. There is one important distinction to note here.
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These are all of the processes that you would expect to be listening for network connections on a fresh install of RHEL 8 running in VirtualBox.įor each listening process you can see the protocol being used, local address and port it is listening on, the user it is running under, and the PID/Program name. There is nothing surprising about the output given our setup.
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When considering the client server model that most networking software is based on, listening processes can be thought of as software that is in “server” mode. On Red Hat Enterprise Linux and Red Hat based systems, use yum, # yum install net-tools On Debian and Debian based systems such as Ubuntu, use apt. We will be using it to accomplish the former. Netstat is a powerful utility that can print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships. $ – requires given linux commands to be executed as a regular non-privileged user # – requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command Privileged access to your Linux system as root or via the sudo command. Netstat, lsof, ifconfig, wireshark, tcpdump Requirements, Conventions or Software Version Used
How to monitor network activity on a Linux system Software requirements and conventions used Software Requirements and Linux Command Line Conventions Category
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