(NAT) Network Address Translation Gateway is a virtual, scalable Oracle Cloud Infrastructure (OCI) component whose throughput & concurrent capacity are automatically adjusted by the gateway itself. It functions as a virtual router, residing in the same logical boundary of the VCN as the Internet Gateway. The NAT Gateway enables cloud resources in a private subnet to initiate outbound connections to the internet while blocking inbound connections initiated from the internet. A VCN can have only one NAT Gateway, which still supports multiple instances in the VCN to concurrently download patches, update operating systems, or connect to external APIs, thanks to its auto‑scalability, without requiring a public IP.

NAT Gateway Creation & Routing Setup

1. Navigation

   Navigation menu > Networking > Virtual cloud networks > spoke_vcn (VCN) > Gateways > NAT Gateways
   

2. Click Create NAT Gateway

3. Fill in all the marked details, and finish by clicking Create NAT Gateway

4. Add Route Rule to the existing Route Table

5. Select NAT Gateway from the drop-down menu

6. Fill in all the marked details, and finish by clicking Add Route Rules.

Testing

Make sure your egress rule allows the 0.0.0.0/0 destination using All Protocols, and then log in to the Application Server to check for available updates from the repositories.

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sudo dnf check-update

Successful