The document provides an overview of networking in Linux, covering the OSI and TCP/IP models, including details about protocols like TCP and UDP, and their characteristics. It discusses the IP addressing scheme and the Ethernet layer, along with various networking commands and socket interfaces. Additionally, it outlines inter-process communication and client/server communication processes.

1. www.techvilla.org.in
TECHVILLA
www.techvilla.org.in

2. www.techvilla.org.in
Networking in linux
 OSI and TCP/IP
 Linux networking layers.
 Inet socket interface.
 Linux networking commands

3. www.techvilla.org.in
OSI Overview
 OSI (Open Systems Interconnection)
 See Figures…

6. www.techvilla.org.in
TCP/IP Model
OSI TCP/IP
Application
Presentation
Session
Transport
Network
Data Link
Physical
Application
Transport
Internet
Host-to-
Network
7
6
5
4
3
2
1
Not
present
TCP
IP

7. www.techvilla.org.in
TCP Overview
 TCP (Transmission Control Protocol)
 Connection-Oriented
 Reliable Protocol
 UDP (User Datagram Protocol)
 Connectionless
 Unreliable Protocol

8. www.techvilla.org.in
IP Overview
 32-bit Unique IP Address
 Network Address
 Subnet Address
 Host Address
140.112.28.XX 140.112.30.XX
Gateway
(Router)

9. www.techvilla.org.in
IP Overview (cont.)
 IP Header

10. www.techvilla.org.in
Ethernet Layer
 48-bit Unique Device Address
 ARP (Address Resolution Protocol)
multicastmulticast
multicast
multicast

11. www.techvilla.org.in
Linux Networking Layers
 Support Mechanism
 Various Networking
 Inter-Process Communication
 A Special Kind of Pipe
 Support Several Address Family…
 Support Several Socket Type…

12. 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

13. 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

14. BSD Sockets
INET Sockets
TCP UDP
IP
PPP SLIP Ethernet
ARP
User
Kernel
Network
Applications
Socket Interface
Protocol Layers
Network Devices

15. Client/Server Communication
Client
1. Create a socket
2. Bind an addr
3. Listen the client
4. Create a socket
Server
Connect
Accept
Send
Recv