11.5.2 Setting Wireless Connection with Configuration File

The default settings for the network in the Raspberry Pi system are stored in the file “/etc/network/interfaces”. In this file, you can activate the wireless connection by directly entering the settings for the wireless connection.

If you have already configured with the window Wi-Fi configuration tool, it will have the following contents, and you will need to delete all this contents.

11.5 Wireless Connection

Starting with the Raspberry Pi 3 model, Wi-Fi devices are installed by default. So you can use Wi-Fi without buying a separate device. However, to use Wi-Fi on previous Raspberry Pi models, you must purchase and install a separate USB Wi-Fi device.

To connect to the network wirelessly via Wi-Fi, you need to connect to a wireless access point, which requires Wi-Fi settings to connect wirelessly. The window in the Raspbian distribution includes a tool to simplify Wi-Fi configuration.

11.5.1 Setting Wi-Fi with Panel Menu

This section describes the settings of Wi-Fi that are installed by default from the Raspberry Pi 3 model.

11.3.2 Communication with Host Name

First, if you run the “ping” command on the Raspberry Pi system, you can get the result as follows.

pi@raspberrypi ~ $ ping raspberrypi

PING raspberrypi (127.0.1.1) 56(84) bytes of data.

64 bytes from raspberrypi (127.0.1.1): icmp_req=1 ttl=64 time=0.182 ms

64 bytes from raspberrypi (127.0.1.1): icmp_req=2 ttl=64 time=0.183 ms

64 bytes from raspberrypi (127.0.1.1): icmp_req=3 ttl=64 time=0.189 ms

64 bytes from raspberrypi (127.0.1.1): icmp_req=4 ttl=64 time=0.208 ms

64 bytes from raspberrypi (127.0.1.1): icmp_req=5 ttl=64 time=0.186 ms

64 bytes from raspberrypi (127.0.1.1): icmp_req=6 ttl=64 time=0.233 ms

11.3 Using Host Name

11.3.1 Setting Host Name

In the Raspberry Pi system, the name of the system itself is called host name. This host name has the function of refering to the Raspberry Pi system itself in the local network. Therefore, when another system in the same network communicates with the Raspberry Pi system, the host name can be used instead of the IP address assigned to the Raspberry Pi system.

11.2.2 Setting Assignment Method of IP Address

Generally, in the way that a computer is assigned an IP address in a network, there are “automatic IP assignment” and “static IP assignment”.

If the DHCP server is set to “automatic IP address assignment”, it has the function of automatically assigning IP addresses to individual computers connected to the internal network managed by the server. Normally, IP address is automatically assigned one by one in the order that each computer is connected to the network. In this way, if the current IP address is assigned to 192.168.0.100, the next connected computer is given an IP address of 192.168.0.101.

11.2 Information for Network Setting

11.2.1 Information for Network Setting

In the Raspberry Pi system, the basic settings for the network are stored in “/etc/network/interfaces” file.

When you check the file contents on the Terminal screen, the following is included.

11.1 Network Overview

11.1.1 Network Connection and IP Address

The IP address must be specified in order for a computer to be connected to the network. This IP address is always used when communicating with other computers on the network. The Raspberry Pi system is also assigned an IP address when connected to the network.

Chapter 11 Network Management

Chapter’s Main Topics

Here, we will look at how to inquire the network information in the Raspberry Pi system and how to configure various setting item to connect to the network through a desired manner.

It includes descriptions on the following topics:
■ Network overview

■ Network setting information

■ Using hostname

■ Wired network connection

■ Wireless network connection

■ Setting static ip

■ Activation and stop of network

■ Bluetooth setting and connection