/etc/network/interfaces
-------------------------
auto lo

iface lo inet loopback
iface eth0 inet dhcp

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

And the /etc/wpa_supplicant/wpa_supplicant.conf file
-------------------------
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
	ssid="linksys"
	key_mgmt=NONE
	auth_alg=OPEN
}

network={
	ssid="ETSUWiFi"
	proto=RSN
	key_mgmt=WPA-EAP
	pairwise=CCMP
	auth_alg=OPEN
	eap=PEAP
	identity="usernamehere"
	password="passwordhere"
}
-----------------------------------