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Networking in linux

OSI and TCP/IP

Linux networking layers.

Inet socket interface.

Linux networking commands

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OSI Overview

OSI (Open Systems Interconnection)

See Figures…

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TCP/IP Model

OSI TCP/IP

ApplicationPresentatio

nSession

Transport

Network

Data Link

Physical

Application

Transport

Internet

Host-to-Network

7

6

5

4

3

2

1

Not present

TCP

IP

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TCP Overview

TCP (Transmission Control Protocol) Connection-Oriented

Reliable Protocol

UDP (User Datagram Protocol) Connectionless

Unreliable Protocol

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IP Overview

32-bit Unique IP Address Network Address

Subnet Address

Host Address

140.112.28.XX 140.112.30.XX

Gateway(Router)

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IP Overview (cont.)

IP Header

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Ethernet Layer

48-bit Unique Device Address

ARP (Address Resolution Protocol)

multicastmulticast

multicast

multicast

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Linux Networking Layers

Support Mechanism Various Networking

Inter-Process Communication

A Special Kind of Pipe

Support Several Address Family…

Support Several Socket Type…

Addr Family

Description

UNIX  Unix domain sockets

INET Internet address family support TCP(UDP)/IP

AX25  Amateur radio X25 

IPX  Novell IPX 

APPLETALK  Appletalk DDP

X25   X25

Socket Type Description

Stream Reliable, Sequenced, Like TCP

Datagram Unreliable, Not sequenced, Like UDP

Reliable Delivered Messages

Like datagram but reliable

Sequenced Packet

Like Stream but fixed size packet

BSD Sockets

INET Sockets

TCP UDP

IP

PPP SLIP Ethernet

ARP

User

Kernel

Network Applications

Socket Interface

Protocol Layers

Network Devices

Client/Server Communication

Client

1. Create a socket

2. Bind an addr

3. Listen the client

4. Create a socket

Server

Connect

Accept

SendRecv