Rasppi-Wifi

Here's what was done to enable the Raspberry Pi (RPi) to use the Edimax WiFi USB adapterso the RPi could act as a wireless access point. To perform these tasks, you need a "Terminal" window - either by plugging the HDMI monitor and USB keyboard to the RPi or by using "ssh" to the DHCP address assigned to the ethernet port. Once you have a ssh connection to the RPi, enter and run the following commands: sudo apt-get update             #### get updates for DNSMASQ install sudo apt-get purge hostapd      #### in case old hostapd exists sudo apt-get install usbmount   #### automatically mount USB device(s)


 * 1) might be worth reading the notes from http://www.jenssegers.be

wget https://github.com/jenssegers/RTL8188-hostapd/archive/v1.1.tar.gz tar -zxvf v1.1.tar.gz cd RTL8188-hostapd-1.1/hostapd

sudo make; sudo make install sudo apt-get install chkconfig sudo chkconfig --add hostapd sudo apt-get install dnsmasq

Now create or modify the following files to contain the following content (feel free to first back up these files before you change them!):

/etc/network/interfaces    Note: All entries must begin in the first column on each line! auto lo   iface lo inet loopback iface eth0 inet dhcp # if you have a static IP address for ethernet # connection, it will look something like this # iface eth0 inet static # address 141.214.200.154 # netmask 255.255.255.192 # gateway 141.214.200.129 # broadcast 141.214.200.191

allow-hotplug wlan0 iface wlan0 inet static address 192.168.42.1 netmask 255.255.255.0

/etc/hostapd/hostapd.conf  Note: All entries must begin in the first column on each line! interface=wlan0 ssid=UMMSPI      #### or whatever you want you WiFi SSID name to be hw_mode=g channel=6 auth_algs=1 wmm_enabled=0

/etc/sysctl.conf    Un-comment the following "lines:     # Uncomment the next line to enable packet forwarding for IPv4    net.ipv4.ip_forward=1'''

# Uncomment the next line to enable packet forwarding for IPv6 # Enabling this option disables Stateless Address Autoconfiguration # based on Router Advertisements for this host net.ipv6.conf.all.forwarding=1'''

/etc/dnsmasq.conf interface=wlan0 expand-hosts domain=local dhcp-range=192.168.42.10,192.168.42.200,24h dhcp-option=3,192.168.42.1'''

#NOTE: If you are going to use this Access Point while connected to an ethernet uplink   '' # on the UMHS campus, you must add the following lines to the /etc/dnsmasq.conf file:'' # use this only on the UMHS campus # otherwise, comment it out or our friends in Africa # will be blocked from all *.med.umich.edu content! # address=/med.umich.edu/127.0.0.1'''

Append the following line to the /etc/hosts file: 192.168.42.1 www.ummspi.net

Add the following "ping" command and the "forward" commands to /etc/init.d/rc.local file. These will keep wifi adapter from going to "sleep" and will forward all non-local wifi traffic to the ethernet uplink, if it exists)     case "$1" in     start) do_start''' ping -i 15 192.168.42.200 &amp;                   ### Add this line iptables -t nat -A POSTROUTING -j MASQUERADE  ### Add this line ;; Reboot the RPi and you should know be able to connect to the RPi provided wireless network "UMMSPI". If there is a ethernet cable plugged into the RPi, the RPi will try to use the ethernet cable as the internet up-link for users connected to the "UMMSPI" network.