Post on 15-Apr-2017
transcript
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