Network Management on Linux

Basic Configuration

Set an IP address with a default gateway.

sudo ip a add dev eth0 10.0.0.5/24
sudo ip route add default via 10.0.0.1

Route Management

Show route table.

ip route

Add/delete a default gateway.

sudo ip route add default via 10.0.0.1
sudo ip route del default

Add/delete a specific route.

sudo ip route add 10.20.0.0/24 via 10.0.0.1
sudo ip route del 10.20.0.0/24 via 10.0.0.1

VLAN Management

Install the required kernel module.

sudo aptitude install vlan

Load the kernel module.

sudo modprobe 8021q

Add a virtual interface using a VLAN tag.

sudo vconfig add eth0 45

Request an IP address for this VLAN.

sudo dhclient -v eth0.45

Get information about current VLAN configuration.

sudo cat /proc/net/vlan/config

Release an IP address obtained via DHCP

sudo dhclient -r eth0.45

Remove a VLAN from an interface.

sudo vconfig rem eth0.45

Unload the module.

sudo rmmod 8021q

Wi-Fi Management

Connect to a WPA Wi-Fi using wpa_supplicant

wpa_passphrase 'ESSID' 'W1fi_P@$$w0rd' > essid.conf
sudo wpa_supplicant -c essid.conf -i wlan0

Lower Level Access

Get hardware info.

iw dev wlan0 info

Change the card mode (monitor/managed).

iw dev wlan0 set type monitor
iw dev wlan0 set type managed

or

iwconfig wlan0 mode monitor
iwconfig wlan0 mode managed

Wi-Fi scans.

iwlist wlan0 scan

or

nmcli device wifi list

or

# optionnal: airmon-ng check wlan0 or airmon-ng check kill wlan0
airmon-ng start wlan0
airodump -i wlan0

NetworkManager

Tell NetworkManager to not manage an interface:

nmcli device set wlan0 managed off
nmcli device set wlan0 managed on