cisco-ccna-nat-configuration

Cisco CCNA NAT Configuration

Posted filed under Cisco CCNA.


NAT = Network address translation

Remember the private IP address

10.0.0.0  — 10.255.255.255

172.16.0.0 —-172.31.255.255

192.168.0.0.—– 192.168.255.255

 

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 NAT – use 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 =10.10.10.1; in this case you need to use STATIC NAT

Here is my LAB on NAT/PAT:

Given by ISP 6 public address 198.18.151.97

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

 

/29=255.255.255.248

.11111000

And I have 62 internal IP address that need to go to internet

192.168.91.65—192.168.91.126 with mask /26 255.255.255.192

.11000000

 

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#

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 198.18.151.97 ?

A.B.C.D  End IP address

R1(config)#ip nat pool CCNA 198.18.151.97 198.18.151.102 ?

netmask  Specify the network mask

R1(config)#ip nat pool CCNA 198.18.151.97 198.18.151.102 net

R1(config)#ip nat pool CCNA 198.18.151.97 198.18.151.102 netmask ?

A.B.C.D  Network mask

R1(config)#ip nat pool CCNA 198.18.151.97 198.18.151.102 netmask 255.255.255.248 ?

<cr>

R1(config)#ip nat pool CCNA 198.18.151.97 198.18.151.102 netmask 255.255.255.248

R1(config)#

 

Here is my show run:

 

 

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