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Assessment Title
Rule Text
NSEC3 must be used for all internal DNS zones.
Description
Discussion Text
NSEC records list the resource record types for the name, as well as the name of the next resource record. With this information it is revealed that the resource record type for the name queried, or the resource record name requested, does not exist. NSEC uses the actual resource record names, whereas NSEC3 uses a one-way hash of the name. In this way, walking zone data from one record to the next is prevented, at the expense of some CPU cycles both on the authoritative server as well as the resolver. To prevent giving access to an entire zone file, NSEC3 should be configured and in order to use NSEC3, RSA/SHA-1 should be used as the algorithm, as some resolvers that understand RSA/SHA-1 might not understand NSEC3. Using RSA/SHA-256 is a safe alternative.
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