They have a webserver say abc.com with a public ip say 184.108.40.206 at their HQ.
The client owns the primary dns server for abc.com and is located at HQ and secondary DNS for abc.com is the ISP DNS Server.
Whenever there is change in the DNS entries for abc.com, they modify their DNS server which updates the ISP DNS server which in turn propagates the changes to internet.
This setup is working perfectly fine without any issues.
Now, the client is setting up a DRC (disaster recovery center) located few kms from HQ and connectedd via MPLS. The DRC has its own leased line internet connectivity from the same ISP.
The public ip address of the abc.com server at DRC is say 220.127.116.11
Now the Client has bought a GSS-4492R (rather sold by our PSE & Cisco SE). As per design from CISCO SE, its to be installed at HQ and it will redirect the traffic for abc.com to 18.104.22.168 incase 22.214.171.124 at HQ becomes unavailable due to any reason (provided only 126.96.36.199 server is down and other network infrastructure is running)
I am wondering how GSS will perform the above functionality without disturbing the existing DNS setup. The client doesnt want to disturb their DNS Setup.
Please advise me about the role this GSS can play & add value in the above scenario.
GSS definitely adds value. Unlike Simple DNS services it constantly probe the Servers/Local Load balancers and direct the client to most healthy and least loaded resource.
Simple DNS server has no way to find out if the resource is alive/healthy/loaded.
If they make GSS authoritative for www.abc.com then they are not replacing their DNS Server. They are simply delegating one DNS record to the GSS.
Client's DNS Servers will still contact their primay dns server first and then the primary DNS server will ask Client's DNS server to contact GSS for that particular record (www.abc.com).All the other DNS records that are not delegated to GSS will still be served by their DNS Server.
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