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XCCDF
Guide to the Secure Configuration of Ubuntu 18.04
Services
DNS Server
Disable DNS Server
Disable DNS Server
An XCCDF Group - A logical subset of the XCCDF Benchmark
Details
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Disable DNS Server
DNS software should be disabled on any systems which does not need to be a nameserver. Note that the BIND DNS server software is not installed on Ubuntu 18.04 by default. The remainder of this section discusses secure configuration of systems which must be nameservers.