Setting up Networks

Every OCI project starts with networking. A properly configured network allows your resources to communicate securely, access the internet, and be reached by users. In this project, we’ll create a simple Virtual Cloud Network (VCN) to support our Valheim server and website.

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Step 1 – Create a VCN

OCI Console:

Networking → Virtual Cloud Networks → Create VCN

Choose:

Name: Server-Web-VCN
CIDR: 10.0.0.0/16

Keep ‘Use DNS hostnames in this VNC’ checked

Click Create VCN

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Step 2 – Create an Internet Gateway

Click into the network you have just created then along the top menu click ‘Gateways’:

Name it and click ‘Create Internet Gateway’

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Step 3 – Create a Route Table

If you are using the VCN wizard or the default route table, simply add (or verify) the following route rule:

Destination: 0.0.0.0/0
Target: Internet Gateway

This allows internet access. You do not need to create a separate route table for a simple Valheim/WordPress server. The default route table is perfectly adequate.

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Step 4 – Create a Public Subnet

Click into the network you have just created then along the top menu click ‘Subnets’:

Create:

Name: Public-Subnet
CIDR: 10.0.0.0/24

Most important setting:

Subnet Access = Public Subnet

If you accidentally set this to Yes you won’t get a public IP to set up websites and servers.

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Step 5 – Security List

SSH

Restrict to your home IP only.

TCP 22
Source: Your public IP/32

Example:

81.x.x.x/32

Never leave SSH open to the world if possible.

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Website

TCP 80
Source: 0.0.0.0/0

TCP 443
Source: 0.0.0.0/0

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Valheim

UDP 2456
UDP 2457
UDP 2458

Source: 0.0.0.0/0

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