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Configuring DNS Round Robin in Windows DNS server ?

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Last Modified: 2017-04-09
Hi All,

I'm running Windows Server 2008 R2 as my External DNS server (Production).
I've deployed new email gateway security appliance in my environment so in total there are two running in the same DataCenter.

So If I just add the same A record with name mail.domain.com pointing to the new IP address of my appliance, does it means that the DNS query or flow will be automatically Round Robin between the same mail.domain.com with two A records ?

So assuming that one A record is deleted, the email flow should then automatically stop to the IP address of my email gateway ? (drain stop it).

Thanks in advance.
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Mal OsborneAlpha Geek
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Senior IT System EngineerSenior Systems Engineer
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Cool, so what about the Public DNS record replication or changes?

How long usually does it takes for the change like this to be reflected all around the Global public DNS ? Is there any way to expedite / reduce the time perhaps ?
Alpha Geek
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Senior IT System EngineerSenior Systems Engineer
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Ah I see,

So in my Public (External) Windows DNS server, shall I change the TTL of the A-Record 24 hours before the change window ?
and then leave it back to normal of 8 hrs after the maintenance ?
Mal OsborneAlpha Geek
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Mal OsborneAlpha Geek
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Senior IT System EngineerSenior Systems Engineer
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Commented:
Thanks Mal,

So shall I edit the TTL and wait for 24 hrs or I can change it for 1 hour and then just wait for 1 hour for the record to be replicated across the globe, then followed by Deleting the A record when I'm doing the maintenance ?
Senior IT System EngineerSenior Systems Engineer
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Thanks Mal !

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