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NAT (PAT) by Mind Map: NAT (PAT)

1. Static NAT (one-to-one mapping)

1.1. Define the router’s interfaces as inside or outside:

1.1.1. R0uter(config-if)#ip nat inside (or ip nat outside)

1.2. Define static mapping between the inside address and the outside address:

1.2.1. R0(config)#ip nat inside source static 10.0.0.1 200.0.0.2

2. Dynamic NAT (one-to-one mapping)

2.1. Define a pool of addresses (public IP) to be used for dynamic NAT allocation

2.1.1. Router(config)#ip nat pool pool_name start_ip end_ip { netmask netmask | prefix-length prefix-length }

2.2. Configure a standard access control list to define what internal traffic will be translated

2.2.1. Router(config)#access-list access-list-number permit source [source-wildcard]

2.3. Link the access list to the NAT pool

2.3.1. Router(config)#ip nat inside source list access-list-number pool pool_name

3. PAT (NAT Overloading) (many-to-one mapping)

3.1. Configure a standard access list to define what internal traffic will be translated

3.1.1. RouterA(config)# access-list 1 permit 192.168.0.0 0.0.0.255

3.2. Link the access list to the interface to be used for PAT

3.2.1. RouterA(config)# ip nat inside source list 1 interface fa0/0 overload

3.3. Define interfaces as either inside or outside

3.3.1. R0uter(config-if)#ip nat inside (or ip nat outside)

4. NAT terms

4.1. Inside local address

4.2. Inside global address

4.3. Outside local address

4.4. Outside global address