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NAT = Network address translation

Remember the private IP address  — —-—–


The goal is to convert your Private IP address to PUBLIC address so that your internal people can access the internet


I have 2 Kind:

1) Dynamic NATuse it when you need your private network go out to internet – It has two kind


  • Suppose I have 6 private and then ISP give you 6 public then all six people go to internet
  • Suppose I have 62 private and ISP only give you 6 public in this case ; you must use the key word “OVERLOAD” ; This concept is call PAT (Port Address Translation)



2) Static NAT use it when you need the internet people come to your webserver; that is located in private Lan =; in this case you need to use STATIC NAT

Here is my LAB on NAT/PAT:

Given by ISP 6 public address

.98, .99,100,101,102  with subnet mask /29




And I have 62 internal IP address that need to go to internet— with mask /26



Step 1) Define the pool of inside Global address (Public address)

That inside Local address will be translated to:

Hint: Always always start with IP Nat?


R1#config t

Enter configuration commands, one per line.  End with CNTL/Z.

R1(config)#ip nat ?

inside   Inside address translation

outside  Outside address translation

pool     Define pool of addresses

R1(config)#ip nat poo

R1(config)#ip nat pool ?

WORD  Pool name

R1(config)#ip nat pool CCNA ?

A.B.C.D  Start IP address

R1(config)#ip nat pool CCNA ?

A.B.C.D  End IP address

R1(config)#ip nat pool CCNA ?

netmask  Specify the network mask

R1(config)#ip nat pool CCNA net

R1(config)#ip nat pool CCNA netmask ?

A.B.C.D  Network mask

R1(config)#ip nat pool CCNA netmask ?


R1(config)#ip nat pool CCNA netmask



Here is my show run:



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