How to configure a wlan interface on hotspot mode



1 Configure a wlan interface on hotspot mode[edit]

  • Configure the wlan interface for systemd/netword

Add the following rule on /lib/systemd/network/

Board $> cat /lib/systemd/network/hostapd.network
[Match]
Name=wlan0

[Network]
Address=192.168.72.1/24
DHCPServer=yes
IPForward=ipv4
IPMasquerade=yes

192.168.72.1/24: ip address affected to the hotspot device.

This configuration supports dhcpserver, ip forward and ip masquerade for this wlan interface: wlan0.

  • Create the hotspot configuration by replacing /etc/hostapd.config content by the following lines
Board $> cat /etc/hostapd.conf
interface=wlan0
driver=nl80211
# mode Wi-Fi (a = IEEE 802.11a, b = IEEE 802.11b, g = IEEE 802.11g)
hw_mode=g
ssid=STExampleNetwork
channel=7
wmm_enabled=0
macaddr_acl=0
# Wi-Fi closed, need an authentication
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=ExamplePassphareNetwork
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

STExampleNetwork is the visible name of the new wlan hotspot (SSID).

ExamplePassphareNetwork is the passphare associated to the wlan hotspot (SSID).

  • Correct one issue with systemd-networkd.service which does not enable the wifi link by default

Add the highlighted line in /lib/systemd/system/hostapd.service file

Board $> cat /lib/systemd/system/hostapd.service
[Service]
ExecStartPre=/sbin/ip link set wlan0 up
ExecStart=/usr/sbin/hostapd /etc/hostapd.conf -P /run/hostapd.pid -B
  • Enable systemd service
Board $> systemctl enable  hostapd

2 How to configure a gateway configuration[edit]

For this example of configuration, the setup is:

  • wlan0: wireless interface connected to SSID_NETWORK with DHCP
  • eth0: ethernet interface with static IP which also have a DHCPserver on it
  • forward of packet are activated between the two network interfaces.

2.1 Configure wireless interface[edit]

Board $> cat /lib/systemd/network/wlan0.network
 [Match]
 Name=wlan0
  
 [Network]
 DHCP=ipv4
 IPForward=ipv4
IPForward
permit to forward all network packet from wireless network to other network.


Configure wireless interface for SSID_NETWORK network:

Board $> mkdir -p /etc/wpa_supplicant/
 echo "ctrl_interface=/var/run/wpa_supplicant" > /etc/wpa_supplicant/wpa_supplicant-wlan0.conf
 echo "eapol_version=1" >> /etc/wpa_supplicant/wpa_supplicant-wlan0.conf
 echo "ap_scan=1" >> /etc/wpa_supplicant/wpa_supplicant-wlan0.conf
 echo "fast_reauth=1" >> /etc/wpa_supplicant/wpa_supplicant-wlan0.conf
 echo "" >> /etc/wpa_supplicant/wpa_supplicant-wlan0.conf
 wpa_passphrase SSID_NETWORK PASSWORD_NETWORK >> /etc/wpa_supplicant/wpa_supplicant-wlan0.conf
 or
 wpa_passphrase SSID_NETWORK  >> /etc/wpa_supplicant/wpa_supplicant-wlan0.conf

Where SSID_NETWORK PASSWORD_NETWORK correspond to the SSID and password of wireless network.

Enable the wireless configuration (to be take into account after reboot):

Board $> systemctl enable wpa_supplicant@wlan0.service
         systemctl restart systemd-networkd.service
         systemctl restart wpa_supplicant@wlan0.service

technology for wireless local area networking with devices based on the IEEE 802.11 standards

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