Redirection pulic IP adress of vm azure to local adress on premise

How about using Reverse Proxy on Azure VM

Step 1: Install a Reverse Proxy

On your Azure VM (10.10.19.2), install a lightweight reverse proxy like:

• Nginx
• Apache HTTP Server
• Caddy
• Or even a custom Node.js/Flask app if you prefer.

Step 2: Configure Proxy Rules

server {
    listen 80;
    location / {
        proxy_pass http://10.10.18.2;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}

This will forward all HTTP traffic from the Azure VM’s public IP to the antenna.

Step 3: Open Firewall Ports

• Ensure port 80 or 443 is open on the Azure VM’s NSG (Network Security Group).
• Confirm that your on-prem antenna allows traffic from 10.10.19.2.

Step 4: Test from Synapse

• From Synapse, call http://10.40.40.40/api/...
• The Azure VM will proxy the request to http://10.10.18.2/api/... via VPN.