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Microsoft DirectAccess Best Practices and Troubleshooting by Jordan Krause

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IPv4 applications don't connect over DA

This one is near and dear to my heart, and I'll tell you the reason why in a minute. DirectAccess is based on IPv6. While you really don't have to know anything about IPv6 to run DirectAccess in your company, you do need to realize that all packets that move over the internet side of the connection, between the DA client and the DA server, are always IPv6 packets. They get wrapped up inside IPv4 so that they can make their way across the Internet, but at the core the packets themselves being generated by the laptops are IPv6 packets. Now, because the DirectAccess server contains the NAT64 and DNS64 technologies, your whole internal network can be IPv4, and that translation works all day every day, right ...

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