Not directly related to cloaking, but probaly the most relevant forum for this discussion..
Trying to determine whether placing two well ranked sites, for similar products, on the same server (due to administration simplicity and use separate DNS zones on different (one using an external DNS service) name servers and IPs in two different class B's, -OR- simply to host one site "off-site" so-to-speak on a different ISP?
The main consideration is whether the SEs would penalize competing sites for collusion if they were simply behind the same core router or if it takes same subnet, or even same machine..?
Obviously this is all speculation, but does anyone have an opinion whether HTTP finger printing to determine sites hosted on the same box have ever been (or likely to be?) an issue from an SEO perspective?
separate DNS zones on different (one using an external DNS service) name servers and IPs in two different class B's,
I think you'll be OK with this strategy. One thing to keep in mind in addition to the above is the whois info for your domains. You want that to be different, too.
About the only way the engines will be able to tell the sites are related is through links (duh) and that the IP addresses (even different Class Bs) are registered to the same company/person. If you go through a large host, though, there should be no problem with that.