The problem with domain masking is it creates perceived duplicate content in search engines, particularly Google. Because Google and the other search engines do not want to display multiple copies of the same content, they will likely choose one or the other of the URLs to index. Worse yet, if Google runs into a lot of duplicate content on your domains, it might decide one or both are not worth visiting very often.
Generally you may want to mask the URL of your content if you are providing content which is on another domain but you don’t want your users to know they are leaving your site. This can be done using frames. It is well known frames are not well liked by the search engines. Also the content of the iframe belongs to the site which you insert in the iframe, not to your site and therefore will not be taken into account for rankings.
If you are masking URLs with <frameset> then there are some things you can do to optimise these pages for SEO.
Use the noframes tag – almost your only search engine friendly alternative to frames. Your optimised content goes between the noframes tag. The noframes element contains content that should only be rendered when frames are not supported by your browser and it’s the equivalent of the ALT attribute for images.
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