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Network in Arch Linux

Changing the network interface names

Add/edit a file in /etc/udev/rules.d/10-network.rules and reboot

SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="c8:5b:76:e5:fc:23", NAME="cable0"
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:28:f8:2b:12:18", NAME="wifi0"

Activating or deactivating network profiles

Create network profiles in /etc/netctl/. There are sample ones in the examples folder.

Stop all profiles: sudo netctl stop-all

Activate ethernet: sudo netctl start ethernet-static

Activate ethernet dhcp: sudo netctl start ethernet-dhcp

Get your public IP

curl https://ipinfo.io/ip you can pipe it to iponmap

curl https://ipinfo.io/ip | iponmap

Check current UL/DL speed

vnstat --live -i wifi0

Extend free wifi at airports

They usually bind the 1h free connection to the MAC address of the device. So after the 1h is out just change the MAC address and connect again.

Change MAC address with macchanger

First install macchanger and then use it like this:

macchanger -r wifi0 obtain a random MAC address

macchanger -p wifi0 return to the hardware factory MAC address

Change MAC address with vanilla commands

This process is a bit longer, just if your haven't yet downloaded macchanger, use this instead:

ip link show wifi0
ip link set dev wifi0 down
ip link set dev wifi0 address xx:xx:xx:yy:yy:yy
ip link set dev wifi0 up

Change MAC address to a rooted Android in terminal

Open termux or any other terminal app and look for your wifi interface (here wlan0):

su
ip link show
busybox ip link show wlan0
busybox ifconfig wlan0 hw ether xx:xx:xx:yy:yy:yy

Warning! These changes are permanent

Block/unblock wireless devices to save battery

List the wireless devices rfkill

[unix ~]$ rfkill
ID TYPE      DEVICE                   SOFT      HARD
 0 bluetooth tpacpi_bluetooth_sw   blocked unblocked
 1 wlan      phy0                unblocked unblocked

And block (or unblock) the desired one sudo rfkill block 1.

Tailscale (do not use the snap)

The Canonical snap is strictly confined. That means:

  • tailscale ssh will not work.
  • If Tailscale SSH mode is on (tailscale set --ssh), normal SSH over the tailnet also fails. Disable it: tailscale set --ssh=false.
  • tailscale update does not work; use sudo snap refresh tailscale.
  • tailscale file cp / tailscale cert only see snap-writable paths (e.g. ~/snap/tailscale/common/).
  • tailscale drive share does not work.

sudo snap refresh tailscale only updates the same confined snap. It does not make Tailscale SSH work. Replace the snap with the official Linux package. This is a new node: you re-authenticate, you get a new Tailscale IP, then delete the old snap node in the admin console.

On the machine (local console):

. /etc/os-release
echo "$ID $VERSION_ID"
which tailscale
snap list tailscale

Debian / Ubuntu (official install):

sudo snap remove --purge tailscale
curl -fsSL https://tailscale.com/install.sh | sh
sudo tailscale up
sudo tailscale set --ssh
tailscale ip
which tailscale   # must NOT be /snap/bin/tailscale

Arch (Arch Wiki, community package):

sudo snap remove --purge tailscale
sudo pacman -S tailscale
sudo systemctl enable --now tailscaled
sudo tailscale up
sudo tailscale set --ssh
tailscale ip
which tailscale   # must NOT be /snap/bin/tailscale

sudo tailscale up prints a login URL. After auth, tailscale status should show the node online. tailscale set --ssh only works on the official daemon, not the snap.

OpenSSH is a separate backup path (sudo apt install openssh-server / sudo pacman -S openssh, then enable ssh or sshd). Use that if you do not want Tailscale SSH. Do not enable Tailscale SSH on a remaining snap install.

Tailscale is the network path only. It does not install OSes, shrink partitions, or pick GRUB entries. A second-OS install still needs a local console for the first boot.

Check if a remote port is open

[unix ~]$ telnet
telnet> open beachlab.org 80
Trying 95.17.151.251...
Connected to beachlab.org.
Escape character is '^]'.

Download an entire website

npm install website-scraper website-scraper-puppeteer

Create index.js with this content

// index.js
const scrape = require('website-scraper');
const PuppeteerPlugin = require('website-scraper-puppeteer');
const path = require('path');

scrape({
    // Provide the URL(s) of the website(s) that you want to clone
    // In this example, you can clone the Our Code World website
    urls: ['https://URL/'],
    // Specify the path where the content should be saved
    // In this case, in the current directory inside the ourcodeworld dir
    directory: path.resolve(__dirname, 'DIRECTORY'),
    // Load the Puppeteer plugin
    plugins: [ 
        new PuppeteerPlugin({
            launchOptions: { 
                // If you set  this to true, the headless browser will show up on screen
                headless: true
            }, /* optional */
            scrollToBottom: {
                timeout: 10000, 
                viewportN: 10 
            } /* optional */
        })
    ]
});

And run npm index.js