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Exchange email access resilience using DNS round robin ?

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Last Modified: 2017-07-20
People,

I'm trying to implement email resiliency solution internally and also externally with no Load Balancer access, so I came up with the below Idea:

http://www.tutorius.com/setting-up-a-dns-round-robin-in-windows
http://exchange929.blogspot.com.au/2013/10/high-availability-for-exchange-2013-cas.html

which I will be applying for all of my Exchange Server 2013 Std. Edition running CAS role:

Internally
AutoDiscover.domain.com points to CAS server 1 internal IP address on AD Site 1
OWA.domain.com points to CAS server 1 internal IP address on AD Site 1

AutoDiscover.domain.com points to CAS server 2 internal IP address on AD Site 2
OWA.domain.com points to CAS server 2 internal IP address on AD Site 2

...

AutoDiscover.domain.com points to CAS server N internal IP address on AD Site N
OWA.domain.com points to CAS server N internal IP address on AD Site N

and also Externally
AutoDiscover.domain.com points to CAS server 1 public IP address on the internet.
OWA.domain.com points to CAS server 1 public IP address on the internet.

AutoDiscover.domain.com points to CAS server 2 public  IP address on the internet.
OWA.domain.com points to CAS server 2 public  IP address on the internet.

...

AutoDiscover.domain.com points to CAS server N public IP address on the internet.
OWA.domain.com points to CAS server N public  IP address on the internet.

I know how to add those entries since both DNS servers are using Windows, but how do I set the TTL to just 15 seconds for the OWA and AUtodiscover entries only?

What's the impact if I reduce the TTL on the forward lookup zones which impact all domain.com lookup ?

Thanks in advance,
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Senior IT System EngineerSenior Systems Engineer
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OK, but in this case, if I want to achieve "some sort" of site resiliency, can I still use the DNS round-robin with the above approach?
Senior IT System EngineerSenior Systems Engineer
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Thanks !
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