Network Configuration

1. Connect Wi-Fi

• Desktop system

  Use the Wi Fi management tool in the upper right corner of the menu bar to connect to Wi Fi, as shown in the figure below.

  Click on the Wi Fi name you want to connect to, and then enter the Wi Fi password in the pop-up dialog box.

  

• Command line

  For users using the Ubuntu Server version system, wireless network configuration can be completed through the command line, as follows.

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sudo nmcli device wifi rescan        # Scan WiFi network
sudo nmcli device wifi list          # List the WiFi networks found

Enter the following command to connect to the specified WiFi network.

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sudo wifi_connect "SSID" "PASSWD" 

When the terminal returns the message 'successfully activated', it indicates that the WIFI connection is successful.

If the following message is returned after connecting to the hotspot, it means that the hotspot was not found. You can execute the sudo nmcli device wifi rescan command to rescan and connect again.

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root@ubuntu:~# sudo wifi_connect "WiFi-Test" "12345678" 
Error: No network with SSID 'WiFi-Test' found.

2. Wired network

The wired network of the development board defaults to a static IP configuration, with an initial IP address of "192.168.1.10".

The static network configuration of the development board is saved in the file '/etc/network/interfaces'.

By modifying fields such as' address',' netmask ',' gateway ', etc., the static IP configuration can be modified.' metric 'is the network priority configuration, set to' 700 'to lower the priority of wired networks.

When both wired and wireless networks are enabled, wireless networks will be prioritized. For example:

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sudo vim /etc/network/interfaces

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# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d
auto eth0
iface eth0 inet static
    address 192.168.1.10
    netmask 255.255.255.0
    gateway 192.168.1.1 
    metric 700

After the modification is completed, enter the sudo restart_network command on the command line to make the configuration take effect.

3. Soft AP mode

The wireless network of the development board runs in Station mode by default.

If you need to use Soft AP mode, please follow the steps below to configure it.

1. Install hostapd 和 isc-dhcp-server

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sudo apt update
sudo apt install hostapd
sudo apt install isc-dhcp-server

2. Run the command 'sudo vim/etc/hostapd.conf' to configure 'hostapd.conf'`

   • Password without WiFi hotspot configuration

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   interface=wlan0
   driver=nl80211
   ctrl_interface=/var/run/hostapd
   ssid=sunrise
   channel=6
   ieee80211n=1
   hw_mode=g
   ignore_broadcast_ssid=0
   

   The default way to open the hostapd.conf file is as shown in the picture: (Configure a password free hotspot, which can be left unchanged).

   

   • Password with WiFi hotspot configuration

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   interface=wlan0
   driver=nl80211
   ctrl_interface=/var/run/hostapd
   ssid=Sunrise
   channel=6
   ieee80211n=1
   hw_mode=g
   ignore_broadcast_ssid=0
   wpa=2
   wpa_key_mgmt=WPA-PSK
   rsn_pairwise=CCMP
   wpa_passphrase=12345678
   

Press i to enter editing mode, press Esc to exit editing mode after editing, press wq to write and close.

3. Configure the 'isc-dhcp server' file, as follows.

   • Execute sudo vim/etc/default/isc-dhcp server to modify the isc-dhcp server file and add the following defined network interface.

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   INTERFACESv4="wlan0"
   

   

   Press i to enter the edit mode. After editing, press Esc to exit the edit mode. Press :wq to write and close.

   • Run sudo vim /etc/dhcp/dhcpd.confmodify dhcpd.conffile, cancel the following comment.

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    authoritative;
   

   Press i to enter the edit mode. After editing, press Esc to exit the edit mode. Press :wq to write and close.

   • Then, add the following configuration to the end of the /etc/dhcp/dhcpd.conf file.

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      subnet 10.5.5.0 netmask 255.255.255.0 { *#Network segment and subnet mask*
      range 10.5.5.100 10.5.5.254;*#Available IP range*
      option subnet-mask 255.255.255.0; *#Subnet mask*
      option routers 10.5.5.1;*#Default gateway*
      option broadcast-address 10.5.5.31;*#Broadcast address*
      default-lease-time 600;*#Default lease duration, unit:s*
      max-lease-time 7200;*#Maximum lease term，unit:s*
    }
   

   Press i to enter the edit mode. After editing, press Esc to exit the edit mode. Press :wq to write and close.

4. Stop wpa_supplicant service，re-start wlan0

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   sudo systemctl stop wpa_supplicant
   sudo ip addr flush dev wlan0
   sleep 0.5
   sudo ifconfig wlan0 down
   sleep 1
   sudo ifconfig wlan0 up
   

5. Follow the steps below to start the hostapdservice.

   • Run sudo hostapd -B /etc/hostapd.confcommand.

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      root@ubuntu:~# sudo hostapd -B /etc/hostapd.conf
      Configuration file: /etc/hostapd.conf
      Using interface wlan0 with hwaddr 08:e9:f6:af:18:26 and ssid "sunrise"
      wlan0: interface state UNINITIALIZED->ENABLED
      wlan0: AP-ENABLED
     

• Use the ifconfig command to configure the IP and network segment of the wireless interface wlan0.

  Note: Keep it consistent with the configuration in step 3.

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sudo ifconfig wlan0 10.5.5.1 netmask 255.255.255.0
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• Finally, turn on the DHCP server and connect to the hotspot, which will assign an IP address between 10.5.5.100 and 10.5.5.255 to the client.

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     sudo systemctl start isc-dhcp-server
  sudo systemctl enable isc-dhcp-server
  

6. Connect to the development board hotspot sunrise

   

7. If you need to switch back to Station mode, you can do as follows.

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   # Stop hostapd
   sudo killall -9 hostapd
   
   # Clear the address of wlan0
   sudo ip addr flush dev wlan0
   sleep 0.5
   sudo ifconfig wlan0 down
   sleep 1
   sudo ifconfig wlan0 up
   
   # Restart wpa_supplicant
   sudo systemctl restart wpa_supplicant
   # Connect to WiFi. For details, please refer to “1. Connect to WiFi”