I've got two domains .. let's say realdomain.com is where the site is and let's say similardomain.com is just a registered domain.
What I normally do ... is I would go into my cPanel of realdomain.com and add as parked domains the similardomain.com
So, when I typed in the URL similardomain.com .. it doesn't redirect to realdomain.com .. but instead operates the realdomain.com as similardomain.com. So, pages like similardomain.com/about/ etc all work no problem.
(example... PetLvr.org is a parked domain for PetLvr.com and will continue to work for all pages http://PetLvr.org/blog/ until a new link is clicked and then revert back to the .com URL). I've been doing this for a while now (the .net, .org, etc TLD's to my larger domains) and don't even know if this is the best way, although my host provider suggested it and it works.
Now - I come to do the same on realdomain.com - which is a 3.0.1 multisite ... and when you type in similardomain.com .. it gives me this URL instead...
> and an error message because I have my network options to deactivate registration.
Any ideas how I can get this to work?