![]() ![]() For example a firewall can look at the URL and decide to block a website. This will block access to any site using the same IP address, in case of shared hosting.Īnalyze/Filter URLs: The firewalls can be programmed to check URLs and block the request if they contain restricted keywords. If there is a request to access a website using IP address to circumvent the DNS spoofing, it can be restricted by blocking access to that specific IP address. If the addresses are poisoned, the DNS caches the URL with wrong addresses, making the website inaccessible.īlocking IPs: The Great Firewall can block access to specific IP addresses. Let’s say your try to access, your browser retrieves the IP address from DNS servers for the website. Since there is no verification of the data by the DNS resolvers, the wrong DNS address remains in the cache until its corrected manually. If the directory contains false information, the requests are redirected to the wrong address. The DNS resolver caches act as a directory of address. The IP addresses are the unique ID’s on the Internet, acting as an identifier for the web requests. This makes the DNS queries return with the wrong address and the users are redirected to an incorrect website.
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