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If you are having multiple websites linking together and those websites are from the same IP address, this is really bad for SEO, and this will hurt your website ranking in search engines and also drop in google pagerank.

As a case study, on April 2007 google updates, I having about 10 websites. And got 2 of them are sitting in the same server and linked to each other. In general all my websites are increased in pagerank, except the two that are sitting in the same server.

The major issue that I identified is one of the two website, the homepage/index page is having pagerank lower than the inner page. I did a backlink checked and all backlinks are going to main page, not the inner page. Question is why the inner page got better pagerank instead?

We know that pagerank from page A flow to Page B when they are linked together. And the inner page pagerank must be come from index page, as there is no external source that link to inner page.

Finally I found out from online webmaster forums, that there are few discussion about this as well. And its concluded that the same IP address is the main caused for this. Some view it as google sandbox. But its not totally correct. Google sandbox is where your website is totally drop from google SERP.

Definitely you will either need to place your websites at different web server at different location, or get a class-c ip address for each of your websites. Hostgator is offering really good seo hosting as well, view here http://www.hostgatorreview.org/hostgator/hostgator-seo/ for more information on seo hosting and how class c ip can help you as well.

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