V-285263

Discussion

In addition to network-based dispersion, authoritative name servers should also be dispersed geographically. 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. A network administrator may choose to use a "hidden" master authoritative server and only have secondary servers visible on the network. A hidden master authoritative server is an authoritative DNS server whose IP address does not appear in the name server set for a zone. If the master authoritative name server is "hidden", a secondary authoritative name server may reside in the same building as the hidden master.

Check Content

1. Navigate to Data Management >> DNS >> Zones tab. 
2. Review each zone by clicking on the hyperlinked zone name in list. 
3. Review the DNS service member (NS) records for each zone hosted (by checking box and clicking the "Edit" icon) and confirm that each authoritative DNS service member is located at a different physical location than the remaining DNS service members. 
Note: Infoblox supports designation as a "stealth" DNS service member, which will not have an NS record. 

If all DNS service members for which NS records are published within a zone are not physically at different locations, this is a finding.