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NAT (Types (Static NAT (Static NAT with Port Translation for Non-Standard…
NAT
Types
Static NAT
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Static NAT with Port Translation
Static NAT with port translation lets you specify a real and mapped protocol (TCP or UDP) and port.
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Dynamic NAT
Dynamic NAT translates a group of real addresses to a pool of mapped addresses that are routable on the destination network
Dynamic PAT
Dynamic PAT translates multiple real addresses to a single mapped IP address by translating the real address and source port to the mapped address and a unique port above 1024. Each connection requires a separate translation session because the source port differs for each connection.
Identity NAT
You might have a NAT configuration in which you need to translate an IP address to itself. For example, if you create a broad rule that applies NAT to every network, but want to exclude one network from NAT, you can create a static NAT rule to translate an address to itself. Identity NAT is necessary for remote access VPN, where you need to exempt the client traffic from NAT.
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NAT Rule Order
Network object NAT
- Static rules.
- Dynamic rules.
Within each rule type, the following ordering guidelines are used:
a. Quantity of real IP addresses—From smallest to largest.
For example, an object with one address will be assessed before an object with 10 addresses.b. For quantities that are the same, then the IP address number is used, from lowest to highest. For example, 10.1.1.0 is assessed before 11.1.1.0.c. If the same IP address is used, then the name of the network object is used, in alphabetical order. For example, abracadabra is assessed before catwoman.
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