Hello,
I have a question regarding domain registration. Specifically, there are a total of 12 domains registered under one DNS and I'm wondering how I can redirect to a particular page on the primary domain.

If I understand correctly, you're wondering how to redirect to a specific page on the main domain when there are multiple domains registered under one DNS. However, DNS does not allow for redirection to individual pages on web servers because it does not know anything about HTTP.

To solve this problem, you can create an HTTP server and configure it so that all the DNS names will lead to a specific page on the server. This can be done using nginx, apache, or another universal web server.

For example, if you configure nginx to run in proxy mode, you can use code similar to this:

server {
  listen 80;
  server_name server1.example.com;

  location / {
    proxy_pass              http://server0.example.com/pageX/;
    proxy_set_header        Host $host;
    proxy_set_header        X-Real-IP $remote_addr;
    proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_connect_timeout  150;
    proxy_send_timeout      100;
    proxy_read_timeout      100;
    proxy_buffers          4 32k;
    client_max_body_size    8m;
    client_body_buffer_size 128k;

  }
}
This configuration ensures that when users access server1.example.com, they will see the content of the page server0.example.com/pageX/. Note that there will be no client redirection; rather, the server will read the page itself and display it.

Overall, creating an HTTP server and configuring it properly using a web server like nginx is the solution to redirecting to a specific page on the primary domain.

you're asking about redirecting to a web page and the need for an HTTP server to process the client request and redirect it. There are various techniques for redirection, but it's important to note that DNS cannot redirect to a web page.

While DNS can provide a different hostname or FQDN through a CNAME record, this simply points to a different domain name rather than a specific web page. To actually redirect the client to a specific web page, an HTTP server is required.

To accomplish this, you'll need to access the DNS settings of the primary domain. First, ensure that the primary domain is pointed to the correct nameservers for your hosting provider. Once confirmed, log in to your domain registrar's account and find the DNS management section for the primary domain.

In the DNS management section, look for the option to add a new record. You'll want to add a "301 redirect" record, which will direct all traffic from the secondary domains to the specific page on the primary domain.

When adding the redirect record, you'll be prompted to enter the source URL (i.e., the secondary domain) and the destination URL (the specific page on the primary domain). Once you save the changes, the DNS settings will be updated, and all traffic from the secondary domains will be redirected to the specified page on the primary domain.
DNS changes may take some time to propagate across the internet, so the redirection may not be immediate. Also, make sure to test the redirection thoroughly to ensure it's functioning as expected.