1. BBBK – WiFi, Ad-hoc network and Wireless access point
Vivek Subbarao, Rudra Dutta
Last updated Spring 2016

2. Enabling WiFi on BBBK Prerequisite Plugin the wireless adapter Reboot
BBBK OS is the one that came pre-installed on Rev C
An active connection to the internet is available till the wireless device is configured
Through wired interface, or shared interface from laptop
Plugin the wireless adapter
Many will work without any further steps (show up in ifconfig output)
Some may require downloading firmware
Wireless device is TP-Link TL-WN722N requires additional firmware
Download firmware and copy it to /lib/firmware
Reboot
Copyright Rudra Dutta, NCSU, Spring 2016

3. Enabling WiFi ifconfig –a apt-get install wireless-tools
Note down the name of the wireless network interface. In most cases it is wlanX, where X is a number, like wlan0, wlan1, wlan2 ….
apt-get install wireless-tools
wpa_passphrase <SSID> <password>
<SSID> – Name of the network you want to connect to like “ncsu-guest”.
<password> – Your network password. If there is none, leave it blank.
Copyright Rudra Dutta, NCSU, Spring 2016

4. Enabling WiFi Output : Copy the pre-shared key value network={
ssid="mySSID"
#pssk="password"
psk=b8721a39d4e01b85a44c5ca932ce742f4a3da0bfb ff56da476cd1 }
Copy the pre-shared key value
Copyright Rudra Dutta, NCSU, Spring 2016

5. Enabling WiFi Open file /etc/network/interfaces
Use any available text editor like nano, vi, vim etc..
Add lines for your wireless network interface as shown below (assuming network is DHCP)
Save the file
auto wlan1
iface wlan1 inet dhcp
wpa-ssid “SSID of your network”
wpa-psk “cd9f22019cbc7ea3158c92eb9447abae5cc dc2d79e4d1ac6237d5d890”
Copyright Rudra Dutta, NCSU, Spring 2016

6. Enabling WiFi Reboot the system
The wireless network interface should come up and acquire an IP address
If not: ifup wlanX
Copyright Rudra Dutta, NCSU, Spring 2016

7. Ad-Hoc network using BBBK
apt-get update
apt-get install wireless-tools
ifconfig –a
Note down the name of the wireless interface
ifconfig wlanX down
iwconfig wlanX mode ad-hoc
iwconfig wlanX essid <Name of the ad-hoc network>
ifconfig wlanX netmask
ifconfig wlanX up
Copyright Rudra Dutta, NCSU, Spring 2016

8. Ad-Hoc Network
Follow the previous steps on all the BBBKs that you want to be part of the ad-hoc network
Give different IP addresses for different BBBKs
In the same address space as given by the netmask
The BBBKs should now be able to communicate with each other
Copyright Rudra Dutta, NCSU, Spring 2016

9. BBBK as a WiFi Access Point
While keeping your internet connection active, execute:
apt-get install hostapd
apt-get install isc-dhcp-server
Edit /etc/network/interfaces and configure the wireless interface as shown below
auto wlanX
iface wlanX inet static
address
network
netmask
broadcast
/etc/init.d/networking restart
Copyright Rudra Dutta, NCSU, Spring 2016

10. BBBK as a WiFi Access Point
Edit /etc/default/hostapd and set
DAEMON_CONF="/etc/hostapd/hostapd.conf”
Save and close the file
Create and open /etc/hostapd/hostapd.conf and add the following lines
interface=wlanX
driver=nl80211
country_code=US
ssid=<my_bbbk_ssid>
channel=7
hw_mode=g
wpa=2
wpa_passphrase=<my_network_password>
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
auth_algs=1
macaddr_acl=0
ignore_broadcast_ssid=0
eapol_key_index_workaround=0
Copyright Rudra Dutta, NCSU, Spring 2016

11. BBBK as a WiFi Access Point
To debug
hostapd /etc/hostapd/hostapd.conf
/etc/init.d/hostapd restart
Edit /etc/dhcp/dhcpd.conf and add the below lines
subnet netmask {
range ; }
Edit /etc/default/isc-dhcp-server to contain the name of your wireless interface as shown below
INTERFACES="wlanX”
/etc/init.d/isc-dhcp-server restart
Reboot
Copyright Rudra Dutta, NCSU, Spring 2016