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Recently I have been hearing from users that they instictively typed my_domain.com and received 404 or other "page not found" errors. This got me to realize that I have no doubt been loosing users.
I now have my_domain.com pointed at the same IP as my_domain.net, although I do not intend to promote it.
I have seen this done at other websites. Can anyone think of any negative repercussion from this?
>> ...whether they have a redirection service...
Unless I hear solid opinions that I should not have the "extra" domain pointing at my pages, I will leave it as it now is. I paid my server a non-refundable service fee to set this up. I found out that they actually assigned different name servers for the .com than I have with the .net, but serving the same pages.
I never thought of a redirection, but I think they (godaddy) do offer this. What's the difference?
Redirection at the registrar simply means that if someone types in yourdomain.com the registrar will redirect them to yourdomain.net (or whatever you set it up as) and so there is little connection the SEDs can find.
Having said that, there are a lot of if's and maybe's in all this. If you are not coming to grief at the moment then leave things as they are, but be prepared to change is you have to.
To briefly answer your question, I would not point your second domain at the same content. I have done this and have been stung. The problem arose when someone else linked to the "non promoted" domain name and a couple of the engines followed the link and booted out all of my promoted pages. The pages that are now in the index have near zero link pop.
An alternative solution is to set up a single page with a link to your main domain.