VMware Tanzu Application Service Compliance
External to the Tanzu Application Service (TAS for VMs) system boundary, compliance with the requirements defined in this control is a deployer responsibility.
Internal to the TAS for VMs system boundary, BOSH DNS provides a trusted, highly available name resolution service that ensures that TAS for VMs is compliant with this control.
Control Description
The information systems that collectively provide name/address resolution service for an organization are fault-tolerant and implement internal/external role separation.
Supplemental Guidance
Information systems that provide name and address resolution services include, for example, domain name system (DNS) servers. To eliminate single points of failure and to enhance redundancy, organizations employ at least two authoritative domain name system servers, one configured as the primary server and the other configured as the secondary server. Additionally, organizations typically deploy the servers in two geographically separated network subnetworks (i.e., not located in the same physical facility). For role separation, DNS servers with internal roles only process name and address resolution requests from within organizations (i.e., from internal clients). DNS servers with external roles only process name and address resolution information requests from clients external to organizations (i.e., on external networks including the Internet). Organizations specify clients that can access authoritative DNS servers in particular roles (e.g., by address ranges, explicit lists).
