Best method to not dilute search indexing
If I have two domains a.com and b.com. Both these domains route to the same site. The a.com domain is the domain that search engines should index. There may be many people that have the b.com domain.
What is the least resource intensive way to make this happen as there is domain maps, redirects, DNS web forwarding or just sticking with two Apache virtual servers and have them answer when they're called.
Currently, there is not a deep page structure, however coming in January there will be, so the method I use should scale well to this page structure growth.
I do have access to the Apache configuration file so a rewrite map is possible.
Your thoughts are appreciated!