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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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PHESupport
Asked:
PHESupport
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3 Solutions
 
Jamie McKillopCommented:
Hello,

You also need an A record for edge.contoso.com

JJ
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MegaNuk3Commented:
Just use mail.contoso.com as MX record and forward incoming port 25 to your edge server

I wouldn't bother with the AutoDiscover name unless you have paid for it to be on your cert already - use a SRV record instead pointing at mail.domain.com:
http://support.microsoft.com/kb/940881
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Adam BrownSr Solutions ArchitectCommented:
You should be good with those DNS settings. Note, though, that if you only have one public IP address, you can use mail.contoso.com as your MX record as well.
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PHESupportAuthor Commented:


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
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Jamie McKillopCommented:
That is correct, you will need both DNS names.

JJ
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Adam BrownSr Solutions ArchitectCommented:
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.
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PHESupportAuthor Commented:
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.
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Jamie McKillopCommented:
Yes, that is what you need.

JJ
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Adam BrownSr Solutions ArchitectCommented:
That should work for you.
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PHESupportAuthor Commented:
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.
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PHESupportAuthor Commented:
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 ?
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MegaNuk3Commented:
Why do you need a HOSTS file on the Edge? Are you not subscribing it?
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PHESupportAuthor Commented:
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
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