Network configuration on a Raspberry Pi

interfaces

# File: /etc/network/interfaces

auto lo
iface lo inet loopback

allow-hotplug eth0
auto eth0
iface eth0 inet dhcp

allow-hotplug wlan0
auto wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

iface default inet dhcp

wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
        ssid="<favoriteNetwork>"
        psk="<password>"
        priority=1000
}

network={
        ssid="<altNetwork>"
        psk="<password>"
        priority=100
}

network={
        ssid="<unsecuredNetwork>"
        key_mgmt=NONE
        priority=1
}