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Lets say someone makes a site and site for webmastes, teaching html, php, asp, web design, etc.

Then, he makes a very big database of domains, and makes a script that visit each domain, and makes the referrer of each hit his site.

Then, the site owners who thinks received some hits, visit his site, which makes him real visitors.

Is that tolerated/legal, or is it a kind of attack?

Thanks all for your answers!