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To quote Packet Filtering for the Internet Firewall:
“Most organizations use an Internet firewall between the Internet and the computers on their perimeter network. The firewall is typically configured with packet filters that allow specific types of traffic to and from the perimeter network computers. When you add a Forefront UAG DirectAccess server to your perimeter network, you must configure additional packet filters, to allow the traffic to and from the Forefront UAG DirectAccess server for all the traffic that a DirectAccess client uses to obtain IPv6 connectivity to the Forefront UAG DirectAccess server.
The following describes the type of traffic you can configure on your Internet firewall depending on whether the Forefront UAG DirectAccess server is on an IPv4 or IPv6 Internet.
Configure packet filters on your Internet firewall to allow the following types of IPv4 traffic for the Forefront UAG DirectAccess server:
Configure packet filters on your Internet firewall to allow the following types of IPv6 traffic for the Forefront UAG DirectAccess server:
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However, there has been a cause for confusion in this documentation because some admins confuse firewalling with NAT. While it is true that most firewalls are deployed with NAT enabled, that doesn’t mean you must NAT connections coming through the firewall. In fact, the UAG Infrastructure and Planning Guide (http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=110b4c77-b411-4845-9b82-40a733b17003) states:
“Are you deploying Forefront UAG as a DirectAccess server?─A Forefront UAG DirectAccess server can be located behind a firewall or between a frontend and backend firewall, but note that a public IPv4 address is required, and therefore the server should not be located behind a NAT (Network Address Translation) device” [italics mine]
So to answer the question - “can you put the UAG DA server” behind a front-end firewall, the answer is yes. However, that firewall cannot NAT connections between the DirectAccess clients and the UAG DirectAccess Server.
Richard Mueller edited Revision 3. Comment: Removed (en-US) from title, add tag
Fernando Lugão Veltem edited Revision 1. Comment: added toc