Quote:
Originally posted by Groove
Many people have had no problems (to date) using a limited number of IPs or even a single IP. Whereas others appear to have been penalised for interlinking sites that clearly belong to the same company/webmaster. That's why if you want to get creative with your interlinking your own sites, it's a sensible precaution to use IPs from separate Class C blocks.
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Some paranoia is certainly healthy, but at the moment this penalty for interlinking sites belonging to the same owner is pure speculation. I've seen panalties for interlinking, but the conclusion that there is any relation with IPs is just a guess, I'd rather assume that google detected an "unnatural" linking structure in these cases or too many pages under one single domain. Most of my small sites with less than 5k subpages stayed stable in the SERPs while two huge one with 50k+ pages were heavily penalised and partly removed (but not kicked, hehe).
So, if you want to be 100% in the future, assuming the IP theory is right, you'd have to make sure each domain has different whois data and different nameservers, too.
I highly doubt that google will ever care what IP, host, nameservers, whois data you have, some sort of filter checking for this data would only hurt the average webmaster while clever SEOs would always find a way to avoid being detected. In addition to this, it requires alot of performance that could be better used for an advanced detection of similar built/script generated pages and affiliate link codes.