Solved

Exchange 2010 ActiveSync over DAG failover

Posted on 2013-01-22
6
1,690 Views
Last Modified: 2013-02-12
Our Exchange DAG environment is spread over two sites. We have a site in Sydney and another in Melbourne.

Sydney is our main office whereas all Exchange Databases are mounted.

Melbourne is used as a disaster recover site when Sydney is ever to go offline.
 
Melbourne and Sydney are connected over the WAN and both have separate external IP addresses.
 
mail.mycompany.com external DNS record points to Sydney
mail-r.mycompany external DNS record points to Melbourne
 
OWA, Smart Phone devices etc are configured to connect to Sydney at mail.mycompany.com
 
Question:

Is it possible to  configure Exchange so that if/when Exchange databases failover to Melbourne in DR then ActiveSync will still be available on iPhone and Android devices?

Thanks for your help
0
Comment
Question by:the_omnific
  • 3
  • 2
6 Comments
 
LVL 7

Expert Comment

by:jimmithakkar
ID: 38809033
Hi

Batter you can configured single external DNS record for Sydney and Melbourne but different TTL value for diff ip add.
0
 
LVL 1

Author Comment

by:the_omnific
ID: 38809040
Can you provide me with information of how to configure this?
0
 
LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 38812220
DNS doesn't give you failover. Even changing TTL etc is not going to do anything.

If you want failover for external clients then you will need to put a load balancer in a third location. Then all clients point to the load balancer and it manages which one is available.

Simon.
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 1

Author Comment

by:the_omnific
ID: 38812517
Hi Simon thanks for that, I didn't think TTL would help to be honest.
 
How do you think I can address the problem when Sydney is online and but mailboxes are mounted in Melbourne?

Melbourne Exchange is a member of the DAG but has a separate CAS.

When this happens, users connecting via OWA get a prompt as pictured. owaWhich is fine! But activesync doesn't work.
0
 
LVL 1

Author Comment

by:the_omnific
ID: 38812620
In order to get ActiveSync working we need to manually change the server address on the iPhone devices.
0
 
LVL 63

Accepted Solution

by:
Simon Butler (Sembee) earned 500 total points
ID: 38812647
DAG only protects the databases, it doesn't do anything for the CAS functionality.
That is why a load balancer would normally be used.

Exchange 2010 can proxy the information, but that requires no external URL set on the server that is hosting the mailboxes.

The only other option apart from using a load balancer would be to have a very low TTL time on the external host name, and then in the event of a failover, manually changing it.

Simon.
0

Featured Post

Enterprise Mobility and BYOD For Dummies

Like “For Dummies” books, you can read this in whatever order you choose and learn about mobility and BYOD; and how to put a competitive mobile infrastructure in place. Developed for SMBs and large enterprises alike, you will find helpful use cases, planning, and implementation.

Question has a verified solution.

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

Suggested Solutions

Lotus Notes – formerly IBM Notes – is an email client application, while IBM Domino (earlier Lotus Domino) is an email server. The client possesses a set of features that are even more advanced as compared to that of Outlook. Likewise, IBM Domino is…
A procedure for exporting installed hotfix details of remote computers using powershell
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…
how to add IIS SMTP to handle application/Scanner relays into office 365.

770 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