Exchange 2010 - what is an ''internet-facing Client Access server ?"

I keep reading in Exchange 2010 setup guides references to : " internet-facing Client Access server".

What is the difference between an " internet-facing Client Access server" and a non- internet-facing Client Access server?  

Is there some special networking considerations/configuration for one versus the other - e.g. one has to have a public IP and the other a private?

Can I have both kinds in an Exchange 2010 environment?

lineonecorpAsked:
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Glen KnightCommented:
An internet facing client access server is one that is accessed from the internet.  A non-internet facing client access server is not accessed from the internet directly but provides Outlook and re-directed OWA access.
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Viral RathodConsultantCommented:
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JamesSenior Cloud Infrastructure EngineerCommented:
The internet facing client access server provides services for external services such Microsoft Active Sync, OWA, Outlook Anywhere etc.
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lineonecorpAuthor Commented:
Thanks. I think I understand the differences.  However still not sure about the answer to my two questions:

Is there some special networking considerations/configuration for one versus the other - e.g. one has to have a public IP and the other a private?

Can I have both kinds in an Exchange 2010 environment?

And  a new thought building from that: If I can have both simultaneously in the same Exchange deployment, is there any special configuration for the two of them to inter-communicate? Is there any need for that? Coordinating/synchronizing a user's internal and external mail?
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Glen KnightCommented:
>>Is there some special networking considerations/configuration for one versus the other - e.g. one has to have a public IP and the other a private?

No, your public IP is assigned to the router, not the Exchange Server.

>>Can I have both kinds in an Exchange 2010 environment?

Yes, but it's unlikely if you don't have multiple sites.

Let me give you an example.

You have 2 Buildings connected via a WAN/VPN etc.  This connection uses your WAN for internet access and doesn't have a dedicated internet service.

You have Exchange and you have a mailbox server & client Access server at the site that doesn't have internet access.  This CAS server is servicing your outlook clients at this site.  This is a non-internet facing Client Access Server because it doesn't have internet access from that site and your users don't access the CAS from the internet.

You have a main site that does have internet access, and all of your users use this connection to get access to OWA, ActiveSync, Outlook Anywhere, this site has an Internet-Facing Client Access Server.  It will proxy requests to the non-internet facing client access server should a mailbox reside on the other site and a user accesses it externally.
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lineonecorpAuthor Commented:
Thanks. That makes it quite a bit clearer.  If I understand it correctly having a non-Internet facing CAS by itself doesn't make much sense.  I would always have an Internet-facing CAS in any Exchange environment and any non-Internet-facing CAS would be in addition to that as circumstance dictated e.g. multiple sites.
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Glen KnightCommented:
correct :)
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