give me the phsical code to make a stongr vpn

Creating a strong VPN involves several steps, including configuring server software, applying encryption, and ensuring secure connection protocols. Below is a high-level overview of how to set up a simple yet strong VPN on a server using OpenVPN, a widely-used open-source VPN solution. Please remember that security involves proper configuration, regular updates, and maintaining best practices.

### Prerequisites
1. **A Server**: You will need a virtual private server (VPS) or a dedicated server. Common providers include AWS, DigitalOcean, or Linode.
2. **Root Access**: You must have root or sudo access to the server.
3. **Basic Linux Commands**: Familiarity with Linux command-line tools.

### Step-by-Step Setup

1. **Install OpenVPN and Easy-RSA**:
   ```bash
   sudo apt update
   sudo apt install openvpn easy-rsa
   ```

2. **Set Up the CA Directory**:
   ```bash
   make-cadir ~/openvpn-ca
   cd ~/openvpn-ca
   ```

3. **Configure the Easy-RSA Variables**:
   Edit the `vars` file in the `openvpn-ca` directory to set your organization details.
   ```bash
   nano vars
   ```
   Update the fields like `KEY_COUNTRY`, `KEY_PROVINCE`, `KEY_CITY`, `KEY_ORG`, etc.

4. **Build the Certificate Authority**:
   ```bash
   source vars
   ./clean-all
   ./build-ca
   ```

5. **Create the Server Certificate and Key**:
   ```bash
   ./build-key-server server
   ```

6. **Generate Diffie-Hellman Parameters**:
   ```bash
   ./build-dh
   ```

7. **Generate HMAC Key**:
   ```bash
   openvpn --genkey --secret keys/ta.key
   ```

8. **Configure the OpenVPN Server**:
   Copy the example server configuration file and edit it:
   ```bash
   gunzip -c /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz | sudo tee /etc/openvpn/server.conf
   sudo nano /etc/openvpn/server.conf
   ```
   Update the configuration to use the keys and certificates you created, at minimum you will want to include:
   ```
   ca ca.crt
   cert server.crt
   key server.key
   dh dh2048.pem
   tls-auth ta.key 0
   cipher AES-256-CBC
   auth SHA256
   ```
   Make sure to change settings according to your security requirements, including UDP protocol and port.

9. **Enable IP Forwarding**:
   Edit the sysctl configuration:
   ```bash
   sudo nano /etc/sysctl.conf
   ```
   Uncomment or add:
   ```
   net.ipv4.ip_forward=1
   ```
   Then apply the change:
   ```bash
   sudo sysctl -p
   ```

10. **Start OpenVPN**:
    ```bash
    sudo systemctl start openvpn@server
    sudo systemctl enable openvpn@server
    ```

11. **Firewall Configuration**:
    Allow traffic on the OpenVPN port (default: 1194):
    ```bash
    sudo ufw allow 1194/udp
    sudo ufw enable
    ```

12. **Create Client Configuration**:
    Create client certificates and a client configuration file, just like you did with the server. Make sure to include the same ca, cert, key, and tls-auth settings.

13. **Connect the Client**:
    Transfer client configuration files to your client machine and use OpenVPN client to connect.

### Additional Security Tips
- Use strong passwords for your VPN accounts.
- Regularly update your server and OpenVPN installation.
- Consider using additional security features like two-factor authentication.

### Disclaimer
Setting up a VPN without proper security practices can expose your data to risks. Always consult with a network security professional to ensure that your specific implementation meets your security requirements.