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Let's say you have different sites / domains on different webhosts with different class-c ips and you interlink them but all your domains have the same whois information. Will the search engines know that those domains are all yours and penalize you for that?
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How else are they going to detect reciprocal linking?
There's no factual evidence but if I were you I would protect your whois or else remove some of the crosslinks (if you're talking about 2-3 crosslinks I wouldn't worry). Stuff like that may not lead to penalties unless your tactics are excessive but it can diminish Google's trust in your backlinks and your forward links. Personally, I don't link out from my main site to any of my lesser domains.