Dynamic NAT works with the same logic compared to Static and PAT. In both structures, they convert private IP addresses on the local network to global IP addresses.
What is Dynamic NAT?
Dynamic NAT is similar to Static and PAT, but the biggest difference is that one of the routes enter manually, the other is that it automatically matches private IP addresses from a pool.
In this NAT type, the IP addresses assigned by the ISP are grouped with the access list and the local network is mapped to this list. It maps global and private IP addresses exactly. And the IP addresses to be converted are mapped to an idle Public IP in this group.
How Does It Work?
The general operation logic of NAT is as follows.
In the above image, the 192.168.1.10 IP address will be subjected to NAT when accessing the Internet and the IP address allocated from the ISP will be placed in the source portion of the IP packet. And the private IP address will use the idle IP address in block 126.96.36.199 – 188.8.131.52.
To better understand the working logic of dynamic NAT, create a network topology in the Packet Tracer as shown in the image below.
In the above image, you can see that the NAT configured on the Router is activated when Pinging the 10.0.0.2 IP address from computers with IP addresses 192.168.10.10 and 192.168.10.20.
You can see that the computers on the LAN use the addresses 10.0.0.5 to 10.0.0.10 allocated from the ISP. Since the first operation on the network is done at 192.168.10.10, the Router has matched the idle 10.0.0.5 IP address.
In addition, the IP address 192.168.10.20 was converted to 10.0.0.6 in the NAT output.
A pool must be created for the dynamic translation.
Configuration ⇒ Video
To understand the logic of Dynamic NAT between two Routers in Packet Tracer, you can watch the video below and also subscribe to our YouTube channel to support us!
Purchasing multiple IP addresses by the ISP is costly, so Dynamic method is not recommended. Instead, the more commonly used PAT is recommended. Thanks for following us!