Very useful command line network monitoring tool like Wireshark. You can see that port 1883 (default MQTT port) is in a listening state. If for example you want to know if the mosquitto broker was active on the server then use:įor more netstat commands see this tutorial- 20 netstat commands You can use it to find out all of the tcp or udp ports that are active on your system.
Very useful tool for finding information on your network connections and ports. However it is also a quick way to find out the address of your gateway as shown in the screenshot below where the gateway address is 192.168.1.1:įor more information on using the command see this article 7. It is only really used if you want your machine to act as a router on your network. Used to display and configure routing information on your host.
Note: the above commands only work if you are using the dhclient daemon.ĭoing this on my PI has no effect as it uses dhcpcd daemon and not the dhclient daemon. To enable more details use the -v (verbose) switch To target a particular interface (e.g eth0) use This you can use to release and renew IP addresses from a DHCP server Hostname -I //shows all IP addresses assigned to host 5. There is an excellent tutorial on using it here. Similar to ifconfig and has most of the same functionality. To shut down or bring up an interface use Ifconfig wlan0 //show Wi-Fi interface details Ifconfig eth0 //show Ethernet interface details Type the command ifconfig at the prompt to view the IP addresses of all interfaces, and use This utility is used for finding network information about your local machine interfaces. To restrict the number of attempts use the -c switch On Linux the command repeats at 1 second interval. The general format is ping hostname or ping IPaddress.
When you ping a device you send that device a short message, which it then sends back (the echo). The ping command is one of the most often used networking utilities for detecting devices on a network and for troubleshooting network problems. Here we look at the 10 commands that I use most often. The networking commands are mainly used for getting network system information and troubleshooting networking problems.
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