What is NAT?
NAT is used to allowing many private ip address to be act as public smaller amount public ip address.
Advantage of NAT: conserve legally registered address(Public) & Reduce address overlap.
Types of NAT: 1) Static:– One to One mapping between public & private address
2)Dynamic– One to many. Dynamic NAT uses a pool of public addresses and assigns them on a first-come, first-served basis.Dynamic NAT is useful
when fewer addresses are available.
3) PAT: Many to one. Multiple unregistered ip address map to a single Public address using ports.
Local Address : The private address before NAT translation.
Global Address: Usually the public addresses. Address used after the NAT translation.