NAT Types
You can implement NAT using the following methods:
•
Static NAT—A
consistent mapping between a real and mapped IP address. Allows bidirectional
traffic initiation.
Static NAT—A
consistent mapping between a real and mapped IP address. Allows bidirectional
traffic initiation.
•Dynamic NAT—A
group of real IP addresses are mapped to a (usually smaller) group of mapped IP
addresses, on a first come, first served basis. Only the real host can initiate
traffic.
Dynamic NAT—A
group of real IP addresses are mapped to a (usually smaller) group of mapped IP
addresses, on a first come, first served basis. Only the real host can initiate
traffic.
•Dynamic Port
Address Translation (PAT)—A group of real IP addresses are mapped to a single IP
address using a unique source port of that IP address.
Dynamic Port
Address Translation (PAT)—A group of real IP addresses are mapped to a single IP
address using a unique source port of that IP address.
•Identity
NAT—Static NAT lets you translate a real address to itself, essentially
bypassing NAT. You might want to configure NAT this way when you want to
translate a large group of addresses, but then want to exempt a smaller subset
of addresses.
Identity
NAT—Static NAT lets you translate a real address to itself, essentially
bypassing NAT. You might want to configure NAT this way when you want to
translate a large group of addresses, but then want to exempt a smaller subset
of addresses. 
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