Tcpdump -D can be used to view the interfaces available to tcpdump. i eth0 for the ethernet port, or tcpdump can be specifically told to listen to any port using -i any. If you have multiple network interfaces (perhaps ethernet and wireless) then the -i command can be used to limit the packet dump to a specific port e.g. Tcpdump starts tcpdump running, but be prepared for a flood of information if you run tcpdump without any arguments. Note: You may need to use sudo before the commands if your user doesn’t have permission. This is fixed with sudo apt-get install tcpdump. When I tried to use the tcpdump command on Raspbian I got the message the command was not found. Tcpdump is a network packet analyser, which lets you see the conversation packets. when we load a webpage in our web browser. Normally a lot of the communication between devices is hidden away from us humans as we don’t need to see our computer ask a DNS server for the IP address for a website URL, then the sending of a GET command to the website IP etc. The communication then takes place in packets.
TCP (Transmission Control Protocol) is a communication standard that devices use to talk establish communications between each other.
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