I have two servers, 1 DNS, and 1 CDNS server, also there is a requirement to deploy each on a separte physically hardware (Both DNS & CDNS can be deployed on singel server but the requirement is to deploy on separate HW.
So, one server is up with only DNS license and second is up with only CDNS license. What traffic flow will be better choice getting high performance?
Keep CDNS as client interfacing IP for any request, if it does not have results in cache, apply a forwarder to DNS server, if DNS server can’t respond to the query, then at last it should consult with Root servers. (LAN/WAN Client --> CDNS server (if caching has no value) --> DNS (if DNS server no record) --> Root Servers) Or
DNS server should face client’s request directly, if it does not have any record/value, it should consult with Cache DNS, and if Cache DNS has no record then finally get update from root server. (LAN/WAN Client --> DNS server (if DNS server has no record) --> CDNS (if CDNS server no Cache record) --> Root Servers)
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