how to prevent dns attacks

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personally test, interested in the use of their own testing.Said so much, each version of the difference seems to be very troublesome, do not know the latest version or later version will not be changed, in fact, there is a more simple version-independent way to prevent the resolv.conf file is rewritten, that is method two.Method Two: independent of version Previously mentioned fixed IP Internet access is mainly modified /etc/network/interfaces This

/** * Protection against DDoS, DNS, cluster attacks * Edit bbs.it-home.org */ Query prohibit IP $ip =$_server[' remote_addr ']; $fileht = ". Htaccess2"; if (!file_exists ($fileht)) File_put_contents ($fileht, ""); $filehtarr = @file ($fileht); if (In_array ($ip. " \ r \ n ", $filehtarr)) Die ("Warning:". ")"." Your IP address is forbided by some reason

people on the internet also said that the modification of /etc/resolvconf/resolv.conf.d/base this file is OK, I did not personally test, interested in the use of their own testing.Said so much, each version of the difference seems to be very troublesome, do not know the latest version or later version will not be changed, in fact, there is a more simple version-independent way to prevent the resolv.conf file is rewritten, that is method two.Method Tw