You have several domains that you want to go to the same IP but this will likely have a negative impact for your site in the search engines. If you “forward” the alternate URLs to the main IP it is often considered spam because you’re trying to index multiple website domain names that point to the same physical content on the server.

A better option is to park the alternate domains on top of the main domain and create a search-engine friendly 301 redirect. Search engines will index only the new URL, but will transfer link popularity from the old URL to the new one so that search engine rankings are not affected. The same behavior occurs when additional domains are set to point to the main domain through a 301 redirect. By using what is called an “IP funnel”, you will have multiple domains pointed to the same site but you won’t risk duplicate content issues.

You can also use a 301 redirection for common misspelled versions of your domain name or for other good domain names that you don’t want your competitors to get.