From time to time you may need to block particular third parties from accessing your sites. There are a number of automatic bots which crawl the Internet, for example, and produce fake visits and site traffic. Additionally, there are spammers that leave links to questionable sites as comments to site articles. This sort of things may significantly undermine your work, since no one likes to visit a website with many hundreds of fake comments, furthermore the increased site traffic from both spammers and bots can create high load on the web server in which your site is hosted, which could result in the site not working correctly. Among the most effective solutions in cases like this is to block the IP addresses that generate the fake traffic, so as to make sure that the visits to your Internet site are legitimate.