Network address Translation (NAT):
Nat mitigate the global IP address Depletion.
Increases the Security By hiding the internal network topology and addressing.
Here NAT Translates Inside address into an Outside address hiding the internal IP range. It is applied to Source IP address.
Two Types of Nating:-
Dynamic NAT:- Translates source address on higher security interfaces to pool on a less security interfaces for outbound connections.
Static NAT:-Provides permanent one-one mapping between on IP for more secure interface with appropriate access list.
Dynamic NAT Commands:-
nat(inside) # internal IP address
global(outside)# IP address
This is the Basic configuration NAT using which we created VPN Security tunnels. which include site to site VPN, client to site etc..
we create access rules for the above security configuration which helps in the full secured network.