Response policy zone
Internet firewall mechanism for DNS / From Wikipedia, the free encyclopedia
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A response policy zone (RPZ) is a mechanism to introduce a customized policy in Domain Name System servers, so that recursive resolvers return possibly modified results. By modifying a result, access to the corresponding host can be blocked.
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Usage of an RPZ is based on DNS data feeds, known as zone transfer, from an RPZ provider to the deploying server. With respect to other blocklist methods, such as Google Safe Browsing, the actual blocklist is not managed, not even seen, by the client application. Web browsers, and any other client applications which connect to servers on the Internet, need the IP address of the server in order to open the connection. The local resolver is usually a system software which in turn puts the query to a recursive resolver, which often is located at the Internet service provider. If the latter server deploys RPZ, and either the queried name or the resulting address are in the blocklist, the response is modified so as to impede access.