From Domain Name System (DNS) Security Requirements Guide
Part of SRG-APP-000218-DNS-000027
Associated with: CCI-000366
In addition to network-based dispersion, authoritative name servers should be dispersed geographically as well. In other words, in addition to being located on different network segments, the authoritative name servers should not all be located within the same building. One approach that some organizations follow is to locate some authoritative name servers in their own premises and others in their ISPs' data centers or in partnering organizations.
Review the NS records for each zone hosted and confirm that each authoritative name server is located at a different physical location than the remaining name servers. If the master, or primary, authoritative name server is configured to be "hidden", it will not have an NS record. One other name server may be at the same physical location as the hidden name server. If all name servers, for which NS records are listed, are not physically at different locations, this is a finding.
Physically move name servers so that they are geographically at different locations. If moving a name server is not feasible, one of the co-located name servers could be reconfigured to be hidden.
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