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Should external DNS be pointed to the CAS/HUB server in an Exchange 2010 environment?

Or should it point to the Mailbox server. Currently I have a CAS/HUB server and a Mailbox DAG backend. Internally clients connect directly to the CAS server but I am afraid that external hosts connect to the Mailbox server also as I do not have the CAS server in DNS. I just noticed this. Why is it still working? How is it working. I don't get it.

Thanks for all your help!

Mike
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SEMDit06
Asked:
SEMDit06
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4 Solutions
 
spiderwilk007Commented:
It should be pointed to the Hub Transport server, that is where the recieve connector resides.
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SEMDit06Author Commented:
Ok I will make that change. Any ideas why everything still works?
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MegaNuk3Commented:
External DNS should point at the external IP of your router/firewall

And then on the router/firewall you set these rules/translations:
Port 443/80 to the CAS
Port 25/587 to HT
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SEMDit06Author Commented:
Thank you for the information. I am just a little baffled why everything still works. Is there a command that will tell you which servers are still acting as the CAS role? I thought for sure I uninstalled the CAS role from the backend mailbox server.
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spiderwilk007Commented:
I guess the backend mailbox server could be redirecting requests to the CAS/HT server. Exchange has a way of doing that.
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MegaNuk3Commented:
Look at your router/firewall and see where you are sending those ports.

As for CAS roles, open EMs and do:
Get-exchangeServer | fl

Then look at the roles each server holds
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SEMDit06Author Commented:
Thank you for your help!
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