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Homer-5837 avatar image
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Homer-5837 asked CandyLuo-MSFT commented

DNS prioritization different networks

HI, I've been looking for a while for an answer to this. Most answers in the forums give an idea on how to solve (thank you btw) but I need more information.

Basically, we have 3 sites with local DNS and Exchange servers in each site. The DNS and Exchange servers are in the /23 network and the workstations are in a different /24 network for each site

192.168.4.0 /23 - Site 1
192.168.8.0 /23 - Site 2
192.168.10.0/23 - Site 3

192.168.24.0/24 - workstation network site 1
192.168.27.0/24 - workstation network site 2
192.168.30.0/24 - workstation network site 3

We have entries for Exchange where we have round robin and netmask ordering enabled. Entries are replicated within the 3 sites

192.168.4.1 - exchange.server1a
192.168.8.1 - exchange.server2a
192.168.10.1 -exchange.server3a
192.168.4.2 - exchange.server1b
192.168.8.2 - exchange.server2b
192.168.10.2 -exchange.server3b

Is there a way to prioritize workstations in site 1 to use exchange.server site 1a/1b without using hosts file? Some stations are laptops and sometimes users connect to the Exchange server through the public IP outside VPN. Stations on the same network have no issues but I can't transfer the stations from the other network.

Tried subnet prioritization and netmaskpriority /23 but seeing that they are from a different network. It is not working.

I was thinking of adding workstation network IP on the Exchange DAG and adding the entry in DNS . However, the existing DAG IPs in the Exchange servers are already in the same network. I haven't really tried but feels like I am opening another can of worms.

windows-dhcp-dns
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Homer-5837 avatar image
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Homer-5837 answered CandyLuo-MSFT commented

Thanks! I think i found what i need. I created a DNS Resolution Policy for each particular subnet and zonescope and it is so far working for my set up.

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CandyLuo-MSFT avatar image
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CandyLuo-MSFT answered

Hi,

Since your environment is more complex, I would suggest you open a case with MS Professional tech support service. In this way , they can have a clear picture about your requirements and your environment by phone communication and live share session.

Here is the link:

https://support.microsoft.com/en-us/gp/customer-service-phone-numbers

Best Regards,
Candy


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