NETWORK ADDRESS TRANSLATION

HOW NAT WORKS AND WHY WE NEED IT?

RESEARCHERS IN 1978

IP ADDRESS

SIZE OF IP ADDRESS

IP ADDRESS

Sender IP

Receiver IP

Data Packet

PROBLEM

IP ADDRESS SIZE Packet Size Amount of IP Address

2 Bit IP address

256 Bit IP address

SOLUTION

32 BIT IP ADDRESS

32 Bit IP address

4,294,967,296 IP Address

IP Version 4

4.2 Billion IP Address

8 Billion People

Multiple Devices

SOLUTION

NETWORK ADDRESS TRANSLATION

Ram’s Laptop

Rina’s Laptop

Smartphone

Home Router

Internet12.13.14.15

Public IP Address

Internet

Private IP Address

192.168.1.2

192.168.1.3

192.168.1.4

192.168.1.1

IP ADDRESS

192.168.x.x

10.x.x.x

Reserved for Private Networks

Internet192.168.1.3 192.168.1.1

Public

Private

40.30.20.10

192.168.1.3:42301 TO 40.30.20.10:80 WHAT IS THE CURRENT MATCH SCORE IND VS AUS?

Internet192.168.1.3 192.168.1.1

Public

Private

40.30.20.10

40.30.20.10:80 TO 192.168.1.3:42301 IND 300/5 43.1 OVERS

Internet192.168.1.3 192.168.1.1

Public

Private

40.30.20.10

12.13.14.15:24604 TO 40.30.20.10:80 WHAT IS THE CURRENT MATCH SCORE IND VS AUS?

12.13.14.15

Internet192.168.1.3 192.168.1.1

Public

Private

40.30.20.10

40.30.20.10:80 TO 12.13.14.15:24604 IND 300/5 43.1 OVERS

12.13.14.15

Internet192.168.1.3 192.168.1.1

Public

Private

40.30.20.10

40.30.20.10:80 TO 192.168.1.3:42301 IND 300/5 43.1 OVERS

12.13.14.15

NAT IS TRANSPARENT

THE FUTURE

IP Version 6

IP VERSION 6

IP Version 4

4,294,967,296 addresses 3.4x1038 addresses

No Need for NAT

IP V4

IP V4

IP V4

IP V4

IP V4

QUESTIONS?THANK YOU