Setup

#This is an overview of all the commands you need to properly configure the Raspberry Pi as an access point server.

#Step 1: Run updates
sudo apt-get update

#Step 2: Check that you are connected to the Internet. The following command should print 5 packets from google.com
ping -c 5 google.com

#Step 3: Install Apache
sudo apt-get install apache2 -y

#Step 4: Navigate to installation folder
cd /var/www/

#Step 5: Change permissions to enter and edit the html file
sudo chown pi: html

#Step 6: Navigate back to home folder
cd

#Step 7: Install server software onto RPi
sudo apt-get install hostapd isc-dhcp-server

#Step 8: Install an iptables manager:
sudo apt-get install iptables-persistent

    #Say "yes" to both config screens (by typing "y")

#Step 9: Set up the DHCP Server - Edit the DHCP file.
sudo nano /etc/dhcp/dhcpd.conf

  #Add a "#" in front of the following lines:
    option domain-name "example.org";
    option domain-name-servers ns1.example.org, ns2.example.org;
  
  #Find the lines that say:
    # If this DHCP server is the official DHCP server for the local
    # network, the authoritative directive should be uncommented.
    #authoritative;

  #Remove the "#" in front of the following lines:
    #authoritative;

  #Add the following code at the bottom of the file:
    subnet 192.168.42.0 netmask 255.255.255.0 {
      range 192.168.42.10 192.168.42.50;
      option broadcast-address 192.168.42.255;
      option routers 192.168.42.1;
      default-lease-time 600;
      max-lease-time 7200;
      option domain-name "local";
      option domain-name-servers 8.8.8.8, 8.8.4.4;
    }

  #Save the file by typing "Control-X", then "Y" and "Enter"
 
#Step 10: Set up the DHCP Server - Edit the default file for the DHCP server
  sudo nano /etc/default/isc-dhcp-server

  #Scroll down to INTERFACES="" and change it to read INTERFACES="wlan0" (or whatever the name of your WiFi adapter is)

#Step 11: Set up wlan0 for static IP.
  sudo ifdown wlan0

  #Set up the wlan0 connection to be static and incoming. Edit the following file:
    nano /etc/network/interfaces
  
  #Edit the file so that it looks like this:
    auto lo

    iface lo inet loopback
    iface eth0 inet dhcp

    allow-hotplug wlan0

    iface wlan0 inet static
      address 192.168.42.1
      netmask 255.255.255.0

     #iface wlan0 inet manual
     #wpa-roam /etc/wpa-supplicant/wpa_supplicant.conf
     #iface default inet dhcp

   #Save the file and exit (Control-X Y)
   
   #Assign a static IP address to the wifi adapter by running:
    sudo ifconfig wlan0 192.168.42.1


#Step 12: Configure Access Point
  sudo nano /etc/hostapd/hostapd.conf
  
  #Write in the following exactly as-is (no extra spaces): 
    interface=wlan0
    ssid=HelloWorld
    country_code=US
    hw_mode=g
    channel=6
    macaddr_acl=0
    auth_algs=1
    ignore_broadcast_ssid=0
    #wpa=2
    #wpa_passphrase=Raspberry
    #wpa_key_mgmt=WPA-PSK
    #wpa_pairwise=CCMP
    #wpa_group_rekey=86400
    ieee80211n=1
    wme_enabled=1
  
  #To enable a password, remove the "#" in front of the 5 lines starting with "wpa" 
  #Change the wpa_passphrase to whatever password you chose for your RPi
  #You can change the network broadcast name by changing the text after "ssid"
  
  #Save and close
  
  #Tell the RPi where to find this configuration file:
   sudo nano /etc/default/hostapd
  
  #Find the line "#DAEMON_CONF="" ", remove the "#" and edit it so it says:
    DAEMON_CONF="/etc/hostapd/hostapd.conf"
  
  #Save and Close
  
  #Edit the initialization file for hostapd:
    sudo nano /etc/init.d/hostapd
    
    #Find the line "DAEMON_CONF="" ", and edit it so it says:
    DAEMON_CONF=/etc/hostapd/hostapd.conf
  
#Step 13: Configure Network Address Translation ("NAT") to allow multiple clients to connect to the Raspberry Pi WiFi:
  #Edit the sysctl configuration file:
    sudo nano /etc/sysctl.conf
    
    #Add the following to the end of the file:
      net.ipv4,ip_forward=1
    
    #Exit and save the file.
  
  #Activate IP Forwarding:
    sudo sh -c “echo 1 > /proc/sys/net/ipv4/ip_forward”

  #Create network translation between eth0 and wlan0:
    sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
    sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
    sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT

  #Ensure NAT happens on reboot:
    sudo sh -c “iptables-save > /etc/iptables/rules.v4”
  

#Step 14: Test your access point.
sudo /usr/sbin/hostapd /etc/hostapd/hostapd.conf

  #Check status of host AP server and DHCP server:
    sudo service hostapd status
    sudo service isc-dhcp-server status

#Step 15: Finishing up by setting up a daemon - a program that starts everytime the RPi boots.
sudo service hostapd start
sudo service isc-dhcp-server start

  #Run the following two commands:
  sudo update-rc.d hostapd enable 
  sudo update-rc.d isc-dhcp-server enable


#Done! Go forth and create! If you need help w/ next steps, go to the "Server Website" folder