UAG DirectAccess–Guess the Device in the Request/Response Path

imageTake a look at the figures below and see if you can guess what device is in the request/response path that you don’t typically see a UAG DirectAccess deployment.

First, the ipconfig output on a DirectAccess client located behind a NAT device:


Figure 1

Now let’s ping DC1:


Figure 2

Now let’s do a tracert from CLIENT1 and DC1:


Figure 3

With this information you should be able to figure out what the “novel” device is in the path between CLIENT1 and DC1. If you know, then consider yourself pretty well-versed with IPv6 addressing. If you don’t know, then here’s a great opportunity to learn something new!


Now take a look at figures 4 and 5 and determine what device was removed from the path:


Figure 4


Figure 5

Think about the solutions and put your answer in the comments section. Give your reasoning. I’ll post the answer and a network diagram of the solution tomorrow.

Have fun!


Tom Shinder
Principal Knowledge Engineer, Microsoft DAIP iX/Forefront iX 
UAG Direct Access/Anywhere Access Group (AAG)
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Comments (9)

  1. Anonymous says:

    You guys are doing great! I added two more figures to make the exercise a bit more interesting.



  2. Anonymous says:

    @Ken –

    No, the UAG server is in the path. But – something was removed.

    This is a pretty tricky (interesting?) scenario – you'll like the explanation tomorrow 🙂



  3. Anonymous says:

    Hey guys,

    I'll post the answer on Friday – got caught up in meetings today.



  4. rfortuno says:

    Is it a 6to4 gateway/router? Due to the fact the hops between the client and DC have 6to4 prefixes and the client is assigned a 6to4 prefix.

  5. Ken Carvel says:

    Is that a separate ISATAP router?  Usually the UAG server would be the ISATAP router, but it looks like this other router is in between them.

  6. Jason Jones says:

    I would guess an IPv6 firewall is in the path; this creates the additional hop in the tracert…

  7. Ken Carvel says:

    Now it looks like the UAG server isn't in the path.

  8. Christoph Falta says:

    I would guess that you also have a native IPv6 deployment in the network where your client is, since the “2002:…” – IPv6 address is assigned to the network adapter itself and not to a 6to4 tunnel adapter.

    That would also explain the IPv6 address marked as “Temporary” (Statless autoconfig?) and the Site-Local IPv6 address (fec0:..).

    So I’d say that you have a native IPv6 router in-between.

  9. Jason Jones says:

    The client is no longer receiving a native IPv6 address and is now using Teredo/IP-HTTPS transition technologies.

    I am guessing the IPv6 firewall or router than was doing RA has been removed and we are relying on IPv4 only (hence the use of transition technolgies)…