I have an MPLS connection to a vendor Lucent 7 (name is fictitious).
We route traffic for login.lucent7.com through the MPLS
Public IP for login.lucent7.com is 126.96.36.199. (Fictitious)
We run Windows DNS services (2012 R2).
Currently, workstations resolve the sub-domain login.lucent7.com (188.8.131.52) via public records – we do not have a zone for lucent7.com. Once resolved, we route the request for 184.108.40.206 out the MPLS instead of the public Internet.
Task: Add a DNS entry for login.lucent7.com into our internal DNS servers for workstation lookup.
Question: How is this accomplished without altering lookups for other lucent7.com sub-domains? Domains like www.lucent7.com
or help.lucent7.com must continue to traverse the public Internet and workstations should find the correct DNS record via the normal lookup process (forwarding servers) and not on our internal DNS servers.