The Environment Information section collects time server and DNS server information.
Specify an IP for the time synchronization server. Although most of the components in the infrastructure can resolve a URL, some can only support IP addresses. If you are using the disconnected deployment option, you must specify a time server on your corporate network that you are sure can be reached from the infrastructure network in Azure Stack Hub. See Time Synchronization.
Enter the DNS servers’ IP addresses.
Azure Stack Hub deploys its own recursive DNS servers that are part of the solutions infrastructure. If they do not have the proper authority, these recursive DNS servers forward DNS name queries to an upstream DNS server. This action ensures that the authoritative resolver for that DNS name can be found, the name resolved, and the result returned to original requester.
Azure Stack Hub DNS servers are only authoritative for the external domain name zone. For queries for DNS names outside of the Azure Stack Hub solution, provide the IP address of a DNS server in your environment that can either resolve these names or forward them as appropriate.
Provide at least two entries (separated by commas) in the DNS Servers (upstream) field. These entries must be IP addresses of valid DNS servers that are accessible from the Azure Stack Hub public infrastructure network (see Network design and infrastructure in the Appendix.) If you do not provide these entries, or if these entries are unavailable, queries for DNS names for endpoints outside of the Azure Stack Hub (for example, Internet endpoints like www.bing.com) will fail.