lost and found ( for me ? ): configure WIFI via /etc/network/interfaces on Ubuntu 14.04

Reference

Here are logs when configuring WIFI via /etc/network/interfaces.

PC model name : HP Pavilion Desktop PC e9360jp/CT

USB WIFI adapter : Buffalo WLI-UC-GNM

OS automatically recognized this USB adapter without installing a driver in my environment, which depends on a USB adapter and/or PC model.

Here is an output of “lsusb” after inserting the USB adapter on my PC.

# lsb_release -a

No LSB modules are available.

Distributor ID: Ubuntu

Description: Ubuntu 14.04.2 LTS

Release: 14.04

Codename: trusty

# uname -ri

3.13.0-48-generic x86_64

# lsusb

Bus 002 Device 005: ID 0bda:0152 Realtek Semiconductor Corp. Mass Storage Device

Bus 002 Device 004: ID 0411:01a2 BUFFALO INC. (formerly MelCo., Inc.) WLI-UC-GNM Wireless LAN Adapter [Ralink RT8070]

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

[ configure WIFI via /etc/network/interfaces ]

I have used WPA2-PSK for an authentication.

Before editing /etc/network/interfaces, generate a WPA PSK from an ASCII passphrase.

# wpa_passphrase essid password

network={

ssid="essid"

#psk="password"

psk=6b7a04357a1882e7dad358f1ec8f5e8440fbb21e1cc49a3f11e75776bded686d

}

Then edit /etc/network/interfaces

auto wlan0

iface wlan0 inet dhcp

wpa-ssid essid

wpa-psk 6b7a04357a1882e7dad358f1ec8f5e8440fbb21e1cc49a3f11e75776bded686d

Finally down and up wlan0 to obtain an IP from DHCP server.

# ifdown wlan0

# ifup wlan0

lost and found ( for me ? )