Using ntopng as a WiFi Access Point/Router+NAT
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Suppose you have a device (e.g. a Raspberry PI) that has a wifi device you want to turn into
a an access point that connects to the Internet though the Ethernet port. ntopng can be used
to enforce traffic policies as described below (valid for Debian-based distributions).

- Edit /etc/wpa_supplicant/wpa_supplicant.conf and edit the configuration (e.g. edit the country field

- If not previously installed do
  # apt-get install hostapd

- Edit /etc/network/interfaces and comment the following lines

  #allow-hotplug wlan0
  #iface wlan0 inet manual
  #    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

- Create a file name /etc/hostapd/hostapd.conf and put the following text

  interface=wlan0
  ssid=ntopng
  hw_mode=g
  channel=6
  auth_algs=1
  wmm_enabled=0
  # The lines below are only for the built-in Raspberry Pi 3 Wi-Fi module
  ieee80211n=1          # 802.11n support
  wmm_enabled=1         # QoS support
  ht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40]

- Edit /etc/default/hostapd and set
  DAEMON_CONF="/etc/hostapd/hostapd.conf"

- Enable hostapd
  # update-rc.d hostapd enable

  and start it

  # service hostapd start

- Install (if not present) DHCPd
  apt-get install isc-dhcp-server

- Configure DHCP by adding this line at the end of /etc/dhcp/dhcpd.conf
  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;
  }

- Edit /etc/default/isc-dhcp-server
  and set
  INTERFACES="wlan0"

Read More
---------
See also the following examples:

- ../tools/wifi_router.sh
  Use ntopng in routing mode

- ../tools/wifi_bridge.sh
  Use ntopng on bridge mode