👀 Views: 60 💬 Answers: 1 📅 Created: 2025-07-23

oci vcn networking json

I'm trying to configure I've searched everywhere and can't find a clear answer... I'm currently setting up a Virtual Cloud Network (VCN) in Oracle Cloud Infrastructure (OCI) and am working with issues with routing that prevent instances from communicating properly. I have a public subnet and a private subnet configured, but my private instance want to reach the internet or the public instance. Here’s what I have done: 1. Created a VCN with a CIDR block of `10.0.0.0/16`. 2. Set up a public subnet (`10.0.1.0/24`) with an attached Internet Gateway. 3. Created a private subnet (`10.0.2.0/24`) without an Internet Gateway. 4. I defined route rules in the route table for the public subnet to direct traffic to the Internet Gateway and the private subnet to direct any traffic destined for `10.0.1.0/24` to the local VCN. The route table for the private subnet looks like this: ```json { "id": "ocid1.routetable.oc1..example", "routes": [ { "destination": "10.0.1.0/24", "networkEntityId": "ocid1.subnet.oc1..example" } ] } ``` Despite my setup, when I attempt to access the public instance from the private instance, I am getting a `Destination Host Unreachable` behavior. I have ensured that the security lists for both subnets allow the right ingress and egress rules. Specifically, the private subnet security list allows egress to `0.0.0.0/0`, but I still want to reach the public instance. I've also checked the Network Security Groups (NSGs) attached to both the public and private instances, and they seem correctly configured to allow traffic. I even tried adding a route for `0.0.0.0/0` in the private route table pointing to my NAT Gateway (which I set up but haven’t been fully integrating yet) but still no luck. Can someone guide to figure out what I might be missing or if there’s a best practice I should be following for this type of setup in OCI? Thanks in advance! Is there a better approach? Any help would be greatly appreciated! Am I approaching this the right way? Any ideas how to fix this? My team is using Json for this service. Cheers for any assistance!