Rasppi-Wifi
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Here's what was done to enable the Raspberry Pi (RPi) to use the Edimax WiFi USB adapter so 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) #### 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 & ### 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.
