Have you ever considered sharing one website with two domains without redirecting? For instance, domain1.com is your main site, and you want to access the site using domain2.com without being redirected to domain1.com. Below, we outline a few simple steps to link multiple domains to a single website.

  1. Navigate to the control panel of your second domain (e.g., domain2.com) and update the nameserver settings to match those of your first domain (domain1.com).
  2. Access your hosting control panel and locate the option for adding a parked domain (note: in Plesk, this is referred to as “Domain Aliases”).
  3. Add domain2.com as a parked domain.

After completing the above steps, you can use domain2.com to access the site of domain1.com.

Note: You must add a canonical URL to avoid search engine indexing issues. To learn more, read these articles.
http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html