Router Services : NAT

               

                                    NAT (Network Address Translation)

 Ø  Nat is going to allow us to use private ip addresses inside of our network and convert them into Publicly Routable address as we go out the outside of network

Ø  Static NAT:-

We gona map inside Local Address (a Private ip address) to a specific inside global address which is publicly routable 

  Ø  Also known as 1 private = 1 Public {ip address} mapping

{Static NAT Configuration}

{Inside interface: - LAN network {internal}

{Outside Interface: - internet (Public ip address}

               Ø  Dynamic NAT

We have Groups (Pool) of inside Global Address and we configure Dynamic NAT to translate them to inside Privates ip address

{To configure Dynamic NAT}

  Ø  we Mention INSIDE and OUTSIDE interface

  Ø  Create Access-list to Permit {our Private} address

  Ø  Also we Create a Pool {range} of Public ip Address

   To creating a pool:-

{Router (config)#ip nat pool PUBLIC_ADDRESS 4.4.4.2 4.4.4.3 netmask 255.255.255.0}

{PUBLIC_ADDRESS :- Pool name (any name)

  Ø  And last we configure all of them in one NAT command

 

PAT (Port Address Translation)

  Ø  In this NAT type we have multiple inside Private address But we have only Single inside Global ip address

  Ø  All of device{like pc switch routers ,etc} inside of your network they need to share only 1 Public routable inside Global address

 

 To Configure PAT

  Ø  Mention the INSIDE and OUTSIDE interfaces

  Ø  Create a access-list for permit or deny the ip address

  Ø  Configure all of 1 NAT statement

Router(config)#ip nat inside source list 1 interface fastEthernet 0/1 overload

{1 :- Access-list no.}

{overload:- all private address are overloaded in single public address}

Configuration of PAT:-

 {now ping to internet and verify}