How to implement a server for dnsleaktest

• Replace all domain name, ip...

Prerequisites

• A linux VPS with free 53 port (DNS standard port)
• A domain with DNS Management Add Edit or Delete DNS Entries

Step 1 — Installing the Server Dependencies

• INFO

  • Server: UBUNTU 17.04
  • Server IP: 1.2.3.4
  • Domain: domain.com
  • Subdomain using for testing: sub.domain.com

• Change to root user

  sudo -i
  

• Install nodejs:

  curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
  sudo apt-get install -y nodejs
  # https://nodejs.org/en/download/package-manager/
  

• Install nginx

  apt install nginx
  

• Install redis-server: https://www.digitalocean.com/community/tutorials/how-to-install-and-use-redis

• Other tools:

  # PM2, run node app
  npm install pm2 -g
  

• Set hostname

  hostnamectl set-hostname ns1
  

• Edit hosts file

  • add this line to end of file 1.2.3.4 ns1.sub.domain.com ns1

   nano /etc/hosts
  

Step 2 - Add A and NS record to DNS Management

Type	Name	Value
A	ns1.sub	1.2.3.4
NS	sub	ns1.sub.domain.com

Step 3 - Config nginx to handle all subdomain ends with "sub.domain.com"

• Create config file /etc/nginx/sites-enabled/sub.domain.com

  # nano /etc/nginx/sites-enabled/sub.domain.com
  server {
    listen 80;
    listen [::]:80;
    root /var/www/html;
    index index.html index.htm index.nginx-debian.html;
  
    server_name ~^(.*)\.sub\.domain\.com$;
  
    location / {
          proxy_pass http://localhost:8080;
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection 'upgrade';
          proxy_set_header Host $host;
          proxy_cache_bypass $http_upgrade;
      }
  }
  

  • Change server_name and proxy_pass
    • proxy_pass is address of your http server instance, this server handler all wildcard domain
  • Restart nginx service nginx restart

Step 4 - Run custom dns server and http server

- Create (remember to change domain in these file):
  - dns_server.js file: [custom_dns_server.js](https://github.com/nhdms/dns-leak-server/blob/master/custom_dns_server.js)
  - http_server.js file: [http_server](https://github.com/nhdms/dns-leak-server/blob/master/httpserver.js)
 - Start app (Using PM2)
  ```
  pm2 start dns_server.js
  pm2 start http_server.js
  ```

Step 5 - Test

• Send request to this address http://unique_string.sub.domain.com

• Get all DNS server IP: XHR