What is DNS redirection?
The domain name system (DNS), sometimes known as the kidnapping of DNS, is the practice of diverting results from the DNS server. DNS surviving is used by some Internet service providers (ISP) to induce a search or help page instead of an error message if the site cannot be found. It can also be used to block websites that contain dangerous or illegal content or as part of a "phishing" attack to steal personal data.
DNS is a critical part of the Internet. DNS converts the domain name, such as Wisegeek.com, into a number of numbers called the Internet Protocol (IP) address. Web browser or other software then contacts the server on this IP address. If the domain name has no corresponding IP address in DNS, the system will return the result of the "non -existent domain" or "nxdomain". This answer, often the result of the domain name written, usually causes the user's web browser to display an error message.
DNS Redirection Eliminates the outcome of the NXDOMAIN error in favor ofh search or hints operated by ISP. This site often contains suggestions that are close to what the user has written. This practice may be useful for some users who are confused by cryptic error messages, but it can also be a source of special income for Internet service providers, as advertising often occurs on this site. It can also cause problems for some applications relying on the outcome of NXDomain, so it is common for an ISP to use DNS redirects to give users "prefer to log".
In addition to being used on non -existent sites, DNS redirection can be used to block access to websites known to contain malware, viruses or illegal content. Rather than returning the IP address of the illegal site, the DNS server returns the user that the content has been blocked. Some ISPs use this technique but can be seen more often on public networks such as schools, libraries and inTernet cafes.
hackers or identity thieves can use DNS redirects for more insidiously. The type of attack known as the "pharmacy" inserts illegitimate DNS settings to vulnerable servers and allows the hacker to redirect traffic to a fraudulent location. For example, the "Pharmmed" DNS server may contain a false list for an online banking website that leads to a carefully created fake fake to make the user reveal their personal data, which is a practice known as "phishing".