exchange 2010 network setup

Posted on 2012-03-23
Medium Priority
Last Modified: 2012-06-27
Hi Experts,

I am new to exchange 2010 and is planning to deploy it to my environment.

The exchange 2010 environment consist of 2 CAS servers and 2 Mailbox servers. The 2 CAS will from a CAS array with MS NLB in unicast mode. There will be a seperated subnet for the NLB traffic to prevent any potential unwanted traffic flooding around the server network. The 2 Mailbox servers will form a DAG.

I would like to know if the mailbox servers will also need to place in the NLB subnet?

Question by:nokyplease
  • 2
LVL 11

Assisted Solution

TheGeezer2010 earned 1336 total points
ID: 37756589
No- the DAG gives you the redundancy for Mailbox role. Please ensure you follow the setup exactly :-


Basically, create your W2008 cluster, then create DAG, then add nodes to the DAG - your Datbases will then enjoy redundancy !

Author Comment

ID: 37758378
if the DAG is not in the same subnet as the NLB then do i need to dual home the CAS?
LVL 12

Assisted Solution

Dave earned 664 total points
ID: 37760198
These are really network design questions , not Exchange questions. So long as the CAS servers can connect to the DAG servers it doesn't really matter of they are on the same network.

The only tweak you might want to make is to do with the DAG witness share , that the DAG servers use to control which is the active server. It usual to put it on one of the CAS servers. In this case you might want to choose another server on your server network.

If you are a smaller concern you might also want to look at using VMWARE ot HYPERV to allow you to co-locate the CAS and Mailbox servers.

Dell has a nice white paper on this here:-


which you might find interesting. The concepts are applicable to any server hardware.
LVL 11

Accepted Solution

TheGeezer2010 earned 1336 total points
ID: 37763063
Remember the Witness share WILL be used for quorum in a two-node DAG, so its needs to be accessible to both nodes - failure to do this will mean you lose quorum.

You require minimum 1 x CAS server, 1 x HT server in each AD ste in which you will house mailboxes. The usual way is to have a 2 x dual-role CAS/HT servers, the CAS array provides your redundancy for client access, the HT will automatically provide redundancy. You will also need to consider PF placement if you use them.


Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Disk errors can be the source of sundry problems for the Exchange server, the most common one being that the database fails to mount.
Configure external lookups on for external mail flow on Exchange 2013 and Exchange 2016.
In this Micro Video tutorial you will learn the basics about Database Availability Groups and How to configure one using a live Exchange Server Environment. The video tutorial explains the basics of the Exchange server Database Availability grou…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …

624 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question