command line network howto

DNS settings

edit /etc/resolv.conf

add a nameserver (8.8.8.8 for google)

get online

• which network interfaces are up?

for ethernet

dmesg | grep "eth"

for wireless

dmesg | grep "wlan"

• which network card(s) do i have? (must have lshw package installed)

lshw -C network

• external wireless card connected

lspci | grep USB

• display and configure network interfaces

ifconfig

• display and configure wireless network interfaces

iwconfig

connect to a network:

iwconfig [iface(wlan0)] essid "[essid]" key s:[password]

need to have wpasupplicant installed, and also allow [iface] in /etc/network/interfaces

#allow-hotplug wlan0
auto wlan0  #bring it on boot, optional
iface wlan0 inet dhcp
#optionally, hardcode the network settings here
    wpa-ssid [essid]
    wpa-psk [password]

then, start the [iface]

ifup wlan0

or restart it

ifdown wlan0
ifup wlan0

• put the interface in promiscuous mode

ifconfig [interface] down
iwconfig [interface] mode Monitor
ifconfig [interface] up