Exchange 2007 Autodiscover DNS CNAME A and SRV Records with Multiple CAS

I've been searching around for information on what DNS records are needed internally (and externally) for Autodiscover to work with multiple CAS (Client Access Server).

I have 3 Exchange 2007 CAS boxes and want to make sure that if one goes down, clients can still locate services using autodiscover.  Each CAS has its own NAT'd IP address externalls (Internet-facing).

I've found a few articles on records that can be put in place (SRV, CNAME, A), but nothing that refers to multiple CAS.  In the past, round-robin DNS entries have been used for such things, but I want to make sure that I have the most high-availability service, without having to put a load balancer in place in front of multiple CAS.

The articles I've found:

Can anyone help me out with what DNS entries I can put in place to handle this?  Internal and external (Internet-facing) please, to handle my internal Outlook clients and my remote Outlook Anywhere clients.
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Shreedhar EtteCommented:
what you should do is use NLB (windows NLB or a load balancer) this is the only way to do what you are looking for

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hp_be_messagingAuthor Commented:
Unfortunately, the author specifies at the beginning of the article: "I used a simple setup with 1 CAS/Hub and 1 MBX server"

I'm trying to determine how to maintain a high-availability autodiscovery service using multiple CAS.
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sorry I didn't get your last post what do you mean ?
hp_be_messagingAuthor Commented:
The answer is there, but with little explanation of how.
hp_be_messagingAuthor Commented:
My response was to the first post with the link.  Thank you for your response...I will be implementing Windows NLB.
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