Solved

CAS array on different network

Posted on 2014-01-23
6
169 Views
Last Modified: 2014-01-24
I am not sure this is possible or not.  Can I create a CAS array by creating 2 CAS servers on 2 different Networks on 2 different AD site, or this is out of the question?
0
Comment
Question by:FundFire
  • 3
  • 3
6 Comments
 
LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 39803880
CAS Arrays are AD site specific.

So while you could have a single CAS Array across two sites (not advised though), if you have them in separate AD sites then you cannot have them in the same array.

This is a good thing, as it allows you to control where the traffic goes. Autodiscover is also AD site aware.

Simon.
0
 

Author Comment

by:FundFire
ID: 39803945
Got it.

Here is my problem though.  I point the webmail to specific server located in Network A.  When the databases moved to another site for some reason to network B;  I have a CAS box in that location.  That takes care of my Outlook users.  They get a message on Outlook that they need to relaunch and all is well.  But my Webmail goes down because it is pointing to specific server on Network A.  I have to go manually change the IP address of Webmail to get it working again.  I really don't want to do that and I don't know how to solve this issue.
0
 
LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 39803966
If you have mailboxes in Site A and you failover to Site B, then you need to ensure that the CAS role holder in Site B does NOT have an external URL configured.
That way CAS will proxy the traffic.
If you do have an external URL configured it needs to be different to the main server. Exchange will then redirect the users.

You need to look at the proxy/redirection TechNet Article to get the configuration correct.

The CAS Array address should be unique to the CAS Array and used internally only. It is only for Outlook MAPI traffic.

Simon.
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:FundFire
ID: 39804024
Thanks I will look into this.  I let you know if something comes up.
0
 

Author Comment

by:FundFire
ID: 39804150
Hi Simon,

What if my CAS box on site A goes down completely which holds the external URL.  All users are in site B now and they all point to Site 2 CAS box which does not have external URL configured, how the users are going to get to Webmail?
0
 
LVL 63

Accepted Solution

by:
Simon Butler (Sembee) earned 500 total points
ID: 39806228
The only automated way is to have a load balancer.
This isn't an Exchange issue, but a DNS issue. There is no availability in DNS, so if you have both IP addresses in the DNS record then all you get is round robin and a confused Exchange server.

Therefore if you want completely transparent high availability the only option is load balancers, or you bring your external traffic in via the second site, and it goes over an internal link.

Simon.
0

Featured Post

Is Your AD Toolbox Looking More Like a Toybox?

Managing Active Directory can get complicated.  Often, the native tools for managing AD are just not up to the task.  The largest Active Directory installations in the world have relied on one tool to manage their day-to-day administration tasks: Hyena. Start your trial today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Find out what you should include to make the best professional email signature for your organization.
A list of top three free exchange EDB viewers that helps the user to extract a mailbox from an unmounted .edb file and get a clear preview of all emails & other items with just a single click on mailboxes.
The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

685 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