Clarification of the NAT rules

Hi all

I understand the notion of NAT and why it is used.  However, I am a little confused given the following command:

object network obj-internal
nat (inside,outside) dynamic interface

Please correct me if I'm wrong, but until now, I understand that this command creates a network called "obj-internal" object and creates a rule for traffic from the interface inside of the external interface.  However, I'm confused with the dynamic interface part.  Could someone please elaborate more on the meaning and usage of this part?  Any help is greatly appreciated.

To create an object you also a definition of what is this object. You also need somethng as a host or a subnet statement.

For this object that you want to specify how to resolve the internal IP address (inside the network) are translated when communicating with the external network. The NAT command in your example uses a dynamic conversion (unlike the static NAT which is generally used for outside - inside the traffic, or when an inside host should always get the same IP address to the outside) who always uses external IP of the SAA. So no matter what internal host communicates with the outside world, they all appear with a single IP address on the destination system.

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Tags: Cisco Security

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