Raspberry Pi_Eng_14.1.4 Network Device


Published Book on Amazon


All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 1
All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 2


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최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (상)
최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (하)


Original Book Contents


14.1.4  Network Device

 

14.1.4.1    Characteristics of Network Device

 

In Linux, a network device is thought of as an entity that sends and receives data packets. A network device is usually a physical device, such as an Ethernet card. However, there are some network devices defined with only software, such as loopback device that is used to send data to itself.

 

On Linux, when the kernel boots, the network devices that it controls are registered with Linux during initialization of the network device driver. As the network device is registered when Linux initializes the network on the system, so no device is registered for devices that do not actually exist.

 

Files created for network devices are not registered in "/dev" directory. To check the contents, you need to use "ifconfig" command.

 


 

14.1.4.2    Device Type and Naming Rules of Network

 

   Writed Ethernet device

    It means a device connected to a network through a wired LAN cable.

    Naming rule      -- eth + n         -- 0, 1, 2

 

   Wi-Fi Ethernet device

    It means a device that connects to the network through Wi-Fi.

    Naming rule      -- wlan + n       -- 0, 1, 2

 

   Loopback device

    A loop back device is a device embedded in a system, not a separate physical device on the network, but a virtual interface device that refers to itself in the network.

    Naming rule      -- lo      

 

   SLIP device

    SLIP (Serial Line Internet Protocol) is one of communication methods that use a telephone modem and is a protocol enabling to connect and use a network using a telephone line.

    Naming rule      -- sl + n           -- 0, 1, 2 ..                    

 

   PPP device

    PPP (Point to Point Protocol) is one of communication methods that uses a telephone modem, and is a protocol enabling to connect and use a network using a telephone line. Compared to SLIP method, although it can handle many packets of protocol at the same time, it is complicated and difficult to implement, so SLIP is usually used.

    Naming rule      -- ppp  + n