Delete The AWS NAT Gateway
After completion of your practice on the NAT Gateway you have to delete it other wise the billing will not stop after deleting the NAT Gateway the Elastic IP address will remain the same it will be released from the NAT Gateway but not from your account. You need to delete the Elastic IP also once the completion of your work is over.
Amazon Web Services – Introduction to NAT GatewaysAWS NAT Gateway Use Cases
To access the Internet, one public IP address is needed, but we can use a private IP address in our private network. The idea of NAT is to allow multiple devices to access the Internet through a single public address. To achieve this, the translation of a private IP address to a public IP address is required. Network Address Translation (NAT) is a process in which one or more local IP address is translated into one or more Global IP address and vice versa in order to provide Internet access to the local hosts. Also, it does the translation of port numbers i.e. masks the port number of the host with another port number, in the packet that will be routed to the destination. It then makes the corresponding entries of IP address and port number in the NAT table. NAT generally operates on a router or firewall.
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