TechNet Wiki Pick of the Week: DirectAccess and Teredo Adaptor Behavior

Here’s this weeks pick from the content on the TechNet Wiki.  It’s an article written by Tom on DirectAccess, IPv6, Teredo and other technologies that resulted from an investigation on performance with Outlook.  I thought the article had the right technical depth and you would find it interesting.  Networking is cool.  Here’s the first couple of paragraph’s from the article:

“In a recent blog post about an interesting problem we had with understanding Outlook performance issues and the IP-HTTPS adapter, we had the opportunity to review how the various IPv6 transition technology adapters worked in terms of when they were enabled and when they were disabled. If you haven’t seen that post, head on over to The Mystery of the IP-HTTPS Listener, an Outlook Client and an IPv4 Only Network at

One of the things that we got a better understanding of was Teredo adapter behavior. First, Teredo is an IPv6 transition technology that is used by DirectAccess clients when they are located behind a NAT device, and thus are typically assigned a private IP address (RFC 1918). Teredo encapsulates the IPv6 packets in an IPv4 packet with a UDP header. The UAG DirectAccess server listens for connections from Teredo clients on UDP port 3544. Therefore, if the DirectAccess Teredo client has outbound access to the UAG DA server’s UDP port 3544, the Teredo connection can be established.”

The full article on the Wiki is located at  Enjoy!

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