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}
Please Upload PDF of Router Services : NAT.
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