SEO penalty for "duplicate" content when a site's also accessible via another domain name?

Posted by tog22 on Pro Webmasters See other posts from Pro Webmasters or by tog22
Published on 2011-02-25T11:19:20Z Indexed on 2011/02/25 15:33 UTC
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seo

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redirects

While testing searches for keywords on my site, I notice that a mirror of it at http://a8.8d.344a.static.theplanet.com/ sometimes appears at the top result rather than my primary domain. It looks like this is an alternative address for my server. Will the presence of identical content at this domain and at my primary domain result in a Google penalty? If so, what can I do about it?

Thanks for any help...

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