Redundant exchange 2010

I have 2 exchange 2010 boxes connected via VPN.  The primary one is where the mx records point to and it does all roles, there isn't a front end one or anything like that.  I am wondering how to setup the 2nd exchange box so it can "take over" if the primary exchange box dies.  Manually changing the DNS to point to the other public IP is something we can do if needed and a downtime of an hour or two is acceptable.  What's the best way to accomplish this?
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rhwimmersAsked:
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Rodney BarnhardtServer AdministratorCommented:
Do you currently have them in a DAG with both active and passive databases? If so, you could create a secondary MX record with a higher weight value. However, I have seen article such as the one below that does not recommend doing this due to spam concerns.

http://blog.zensoftware.co.uk/2012/07/02/why-we-tend-to-recommend-not-having-a-secondary-mx-these-days/

If you already have them in the DAG, part of the same domain, with active\passive databases, then just changing the MX record to point to the second location would work. However, if you would like, you could set up a secondary MX record as an automatic failover.
rhwimmersAuthor Commented:
I do not have them setup in a DAG, I dont think, how can I check and is this the best way to do this?
Rodney BarnhardtServer AdministratorCommented:
The best way to tell if they are in a DAG would be to launch the EMC and go to "Organization Configuration" then highlight "Mailbox". There will then be a tab in the middle that says "Database Availability Groups" with the information in the panels below it. Similar to the information below. I have blacked out my system names. This is the best way to set them up. It will trigger an automatic failover in the event of an outage.

Exchange EMC DAG view
rhwimmersAuthor Commented:
Ok, nothing showing up in DAG - you have a good tutorial for how to get that installed and working?
Rodney BarnhardtServer AdministratorCommented:
I do not personally have one, but I found this one. It had a highly rated review.

https://www.simple-talk.com/sysadmin/exchange/exchange-2010-dag-creation-and-configuration-part-1/

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