Building DNS Firewalls with Response Policy Zones (RPZ)

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A DNS Firewall can help you control what domain names, IP addresses and subnets, and name servers are allowed to function on your network. You can build such a firewall using DNS Response Policy Zones (RPZ), which is an open and vendor-neutral standard for the interchange of DNS Firewall configuration information. DNS RPZ is a standard feature of BIND 9, and is expected to be supported by other (non-BIND) name servers.

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