Connect network terminal linux

How to Connect Wi-Fi from Linux Terminal Using Nmcli Command

There are several command-line tools for managing a wireless network interface in Linux systems. A number of these can be used to simply view the wireless network interface status (whether it is up or down, or if it is connected to any network), such as iw, iwlist, ip, ifconfig and others.

And some are used to connect to a wireless network, and these include: nmcli, is a command-line tool used to create, show, edit, delete, enable, and disable network connections, as well as control and display network device status.

First start by checking the name of your network device using the following command. From the output of this command, the device name/interface is wlp1s0 as shown.

$ iw dev phy#0 Interface wlp1s0 ifindex 3 wdev 0x1 addr 38:b1:db:7c:78:c7 type managed

Next, check the Wi-Fi device connection status using the following command.

iw wlp2s0 link Not connected. 

From the output above the device is not connected to any network, run the following command to scan available Wi-Fi networks.

sudo iw wlp2s0 scan command failed: Network is down (-100) 

Considering the output of the above command, the network device/interface is DOWN, you can turn it On (UP) with the ip command as shown.

$ sudo ip link set wlp1s0 up

If you get the following error, that means your Wifi is hard blocked on Laptop or Computer.

RTNETLINK answers: Operation not possible due to RF-kill

To remove or unblock you need to run the following command to solve the error.

$ echo "blacklist hp_wmi" | sudo tee /etc/modprobe.d/hp.conf $ sudo rfkill unblock all

Then try to turn ON the network device once more, and it should work this time around.

$ sudo ip link set wlp1s0 up

If you know the ESSID of the Wi-Fi network you wish to connect to, move to the next step, otherwise issue the command below to scan available Wi-Fi networks again.

And lastly, connect to the wi-fi network using following command, where Hackernet (Wi-Fi network SSID) and localhost22 (password/pre-shared key).

$ nmcli dev wifi connect Hackernet password localhost22

Once connected, verify your connectivity by doing a ping to an external machine and analyze the output of the ping as shown.

$ ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. 64 bytes from 8.8.8.8: icmp_seq=1 ttl=48 time=61.7 ms 64 bytes from 8.8.8.8: icmp_seq=2 ttl=48 time=61.5 ms 64 bytes from 8.8.8.8: icmp_seq=3 ttl=48 time=61.6 ms 64 bytes from 8.8.8.8: icmp_seq=4 ttl=48 time=61.3 ms 64 bytes from 8.8.8.8: icmp_seq=5 ttl=48 time=63.9 ms ^C --- 8.8.8.8 ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 4006ms rtt min/avg/max/mdev = 61.338/62.047/63.928/0.950 ms

That’s It! I hope this article helped you to setup your Wi-Fi network from the Linux command line. As always, if you found this article useful, share your thoughts in the comment section below.

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How to Connect to WiFi from the Terminal in Ubuntu Linux

In this tutorial, you’ll learn how to connect to wireless network from the terminal in Ubuntu. This is particularly helpful if you are using Ubuntu server where you don’t have access to the regular desktop environment.

I primarily use desktop Linux on my home computers. I also have multiple Linux servers for hosting It’s FOSS and related websites and open source software like Nextcloud, Discourse, Ghost, Rocket Chat etc.

I use for quickly deploying Linux servers in cloud in minutes. But recently, I installed Ubuntu server on my Raspberry Pi. This is the first time I installed a server on a physical device and I had to do extra stuff to connect Ubuntu server to WiFi via command line.

In this tutorial, I’ll show the steps to connect to WiFi using terminal in Ubuntu Linux. You should

• not be afraid of using terminal to edit files
• know the wifi access point name (SSID) and the password

Connect to WiFi from terminal in Ubuntu

It is easy when you are using Ubuntu desktop because you have the GUI to easily do that. It’s not the same when you are using Ubuntu server and restricted to the command line.

Ubuntu uses Netplan utility for easily configuring networking. In Netplan, you create YAML file with the description of network interface and with the help of the netplan command line tool, you generate all the required configuration.

Let’s see how to connect to wireless networking from the terminal using Netplan.

Step 1: Identify your wireless network interface name

There are several ways to identify your network interface name. You can use the ip command, the deprecated ipconfig command or check this file:

This should give you all the available networking interface (Ethernet, wifi and loopback). The wireless network interface name starts with ‘w’ and it is usually named similar to wlanX, wlpxyz.

[email protected]:~$ ls /sys/class/net eth0 lo wlan0

Take a note of this interface name. You’ll use it in the next step.

Step 2: Edit the Netplan configuration file with the wifi interface details

The Netplan configuration file resides in /etc/netplan directory. If you check the contents of this directory, you should see files like 01-network-manager-all.yml or 50-cloud-init.yaml.

If it is Ubuntu server, you should have cloud-init file. For desktops, it should be network-manager file. This is one of the several ways Ubuntu desktop differs from Ubuntu server.

The Network Manager on the Linux desktop allows you to choose a wireless network. You may hard code the wifi access point in its configuration. This could help you in some cases (like suspend) where connection drops automatically.

Whichever file it is, open it for editing. I hope you are a tad bit familiar with Nano editor because Ubuntu comes pre-installed with it.

sudo nano /etc/netplan/50-cloud-init.yaml

YAML files are very sensitive about spaces, indention and alignment. Don’t use tabs, use 4 (or 2, whichever is already used in the YAML file) spaces instead where you see an indention.

Basically, you’ll have to add the following lines with the access point name (SSID) and its password (usually) in quotes:

wifis: wlan0: dhcp4: true optional: true access-points: "SSID_name": password: "WiFi_password"

Again, keep the alignment as I have shown or else YAML file won’t be parsed and it will throw an error.

Your complete configuration file may look like this:

# This file is generated from information provided by the datasource. Changes # to it will not persist across an instance reboot. To disable cloud-init's # network configuration capabilities, write a file # /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following: # network: network: ethernets: eth0: dhcp4: true optional: true version: 2 wifis: wlan0: dhcp4: true optional: true access-points: "SSID_name": password: "WiFi_password"

I find it strange that despite the message that changes will not persist across an instance reboot, it still works.

Anyway, generate the configuration using this command:

If you are lucky, you should have network connected. Try to ping a website or run apt update command.

However, things may not go as smooth and you may see some errors. Try some extra steps if that’s the case.

Possible troubleshooting

It is possible that when you use the netplan apply command, you see an error in the output that reads something like this:

Failed to start netplan-wpa-wlan0.service: Unit netplan-wpa-wlan0.service not found. Traceback (most recent call last): File "/usr/sbin/netplan", line 23, in netplan.main() File "/usr/share/netplan/netplan/cli/core.py", line 50, in main self.run_command() File "/usr/share/netplan/netplan/cli/utils.py", line 179, in run_command self.func() File "/usr/share/netplan/netplan/cli/commands/apply.py", line 46, in run self.run_command() File "/usr/share/netplan/netplan/cli/utils.py", line 179, in run_command self.func() File "/usr/share/netplan/netplan/cli/commands/apply.py", line 173, in command_apply utils.systemctl_networkd('start', sync=sync, extra_services=netplan_wpa) File "/usr/share/netplan/netplan/cli/utils.py", line 86, in systemctl_networkd subprocess.check_call(command) File "/usr/lib/python3.8/subprocess.py", line 364, in check_call raise CalledProcessError(retcode, cmd) subprocess.CalledProcessError: Command '['systemctl', 'start', '--no-block', 'systemd-networkd.service', 'netplan-wpa-wlan0.service']' returned non-zero exit status 5.

It is possible that wpa_supplicant service is not running. Run this command:

sudo systemctl start wpa_supplicant

Run netplan apply once again. If it fixes the issue well and good. Otherwise, shutdown your Ubuntu system using:

Start your Ubuntu system again, log in and generate and apply netplan once again:

sudo netplan generate sudo netplan apply

It may show warning (instead of error) now. It is warning and not an error. I checked the running systemd services and found that netplan-wpa-wlan0.service was already running. Probably it showed the warning because it was already running and ‘netplan apply’ updated the config file (even without any changes).

Warning: The unit file, source configuration file or drop-ins of netplan-wpa-wlan0.service changed on disk. Run 'systemctl daemon-reload' to reload units.

It is not crtical and you may check that the internet is probably working already by running apt update.

I hope you were able to connect to wifi using the command line in Ubuntu with the help of this tutorial. If you are still facing trouble with it, do let me know in the comment section.

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How to connect a wired internet connection through terminal?

I am using Ubuntu 10.04 with KDE on it. I am facing a problem in connecting to a wired LAN internet connection. I want to connect to wired internet connection with static IP and authentication. How can I manage this via terminal?

4 Answers 4

How to configure the network interface using the terminal

You can configure a network interface from the command line using the networking utilities. You configure your network client hosts with the command line by using commands to change your current settings or by editing a number of system files. To configure your network interface card to automatically connect when wired cable is connected you can follow this «simple» steps:

To configure DHCP address, edit the /etc/network/interfaces and enter the following lines replacing eth0 in the example with your network interface card:

`sudo nano /etc/network/interfaces` You should see something similar to this: auto eth0 iface eth0 inet dhcp in my computer it looks like this: auto lo iface lo inet loopback 

So if your network card appears as eth2 for example then you would leave the file like this:

 auto eth2 iface eth2 inet dhcp 

Same procedure as above but you would need to include more information.

Like above, replace eth0 with your networks card name:

sudo nano /etc/network/interfaces

 auto eth0 iface eth0 inet static address 192.168.0.100 gateway 192.168.0.1 netmask 255.255.255.0 network 192.168.0.0 broadcast 192.168.0.255 

After entering all the details which are needed for your static IP you would need to restart networking services using the following command:

sudo /etc/init.d/networking restart

You can add hostname and/or IP addresses to the file /etc/hosts for static lookups.

To cause your machine to consult with a particular server for name lookups you simply add their addresses to /etc/resolv.conf .

For example a machine which should perform lookups from the DNS server at IP address 192.168.0.1 would have a resolv.conf file looking like this:

 search test.com nameserver 192.168.0.1 

in my case it looks like this:

 search cantv.net nameserver 127.0.0.1 

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