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Exchange 2010 and DNS

Hello Everyone,

I am a bit stuck or confused on what my dns records should be for my exchange environment. I have a exchange organisation with 2 MB servers (in DAG) 2 CAS+HT servers and an edge server.

both the CAS+HT Servers are load balanced using barracuda NLB and i have a CAS array as mail.contoso.com (Example) and the mailbox servers are pointing to this CAS Array. I tested creating an account and everything is working fine internally.

Now i installed Edge role in DMZ and i named it edge.contoso.com

Now what will my External DNS Records be. My OWA,OAB,Autodiscover are having mail.contoso.com as external URI.

I was planning these for my external DNS Records :

edge.contoso.com as MX Record
mail.contoso.com as A Record
autodiscover.contoso.com as CNAME Record to mail.contoso.com

Am i in the right direction ? please help. I need to move to production ASAP.

Thank you,
Raj.
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Jamie McKillop
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Thank you all for the replies, but If i put mail.contoso.com also as MX record then all the external email is hitting my CAS Array right? I want all email coming from outside use my edge
That is correct, you will need both DNS names.

JJ
Not necessarily. Traffic goes to an address on a specific port. If you configure your firewalls right, they will forward port 25 to the Edge server and 80/443 to the CAS server.
Just to simplify

mail.contoso.com A record with external IP 1
Edge.contoso.com A Record with external IP 2

MX Record for EDGE.Contoso.com

autodiscover.contoso.com CNAME pointing to mail.contoso.com

Does everyone think this is what i need.

Please correct me if i am wrong.
Yes, that is what you need.

JJ
That should work for you.
Now experts i am stuck with edge config.

As stated I have 2 HT+CAS server NLB using barracuda with virtual IP and fqdn created mail.contoso.com
2 MB servers in DAG

I am implementing Edge in DMZ

now in the hosts file do i have to put the IP and hostnames of HT Servers or Virtual IP (Mail.contoso.com) ?

Please help! I have to move into production all these servers this evening.

Thank you,
Raj.
Just to make the above question clear

In the hosts file of edge will it be mail.contoso.com or HT1.contoso.com , HT2.contoso.com ?
Why do you need a HOSTS file on the Edge? Are you not subscribing it?
to resolve host name of HT servers. I thought i need to add the name and ip so edge can resolve HT server and vice versa