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Re: I-D Action:draft-vandevelde-v6ops-harmful-tunnels-01.txt

On 2010-09-02 15:13, Joel Jaeggli wrote:
> On 9/1/10 7:05 PM, Fernando Gont wrote:
>> Gert,
>>
>>> For the large mass of end users, they don't seem to see a benefit in
>>> deploying IPv6 while their IPv4 internet is still working - so I doubt
>>> that the originally-envisioned usage case of 6to4-with-anycast (3068)
>> Is 6to4-with-anycast the most deployed form of 6to4?
>>
>> FWIW, Windows does not use the 6to4 anycast address, but rather resolves
>> 6to4.ipv6.microsoft.com, 

But that resolves to 192.88.99.1 which *is* the anycast address [RFC3068],
at least where I'm sitting.

C:\>tracert 6to4.ipv6.microsoft.com

Tracing route to 6to4.ipv6.microsoft.com [192.88.99.1]
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms  csrs5.sfac.auckland.ac.nz [130.216.38.254]
  2    <1 ms    <1 ms    <1 ms  com-sci-to-sci-sx.net.auckland.ac.nz [130.216.252.46]
  3    <1 ms    <1 ms    <1 ms  sci-sx-to-com-sci.net.auckland.ac.nz [130.216.252.45]
  4    <1 ms    <1 ms    <1 ms  cx-alfa-to-sx-300.net.auckland.ac.nz [130.216.252.5]
  5    <1 ms    <1 ms    <1 ms  br1-to-cx-alpha.net.auckland.ac.nz [130.216.246.41]
  6    <1 ms    <1 ms    <1 ms  210.7.32.1
  7    <1 ms    <1 ms    <1 ms  210.7.36.67
  8    24 ms    24 ms    24 ms  210.7.47.10
  9    24 ms    24 ms    24 ms  192.88.99.1

Trace complete.

and uses the corresponding a records for the
>> destination address of tunneled packets (Hurrican Electric relays, the
>> last time that I checked). One would guess that for managed 6to4 routers
>> this would be even more so the case.

When I was using 6to4 actively, I scouted out a list of unicast relays,
because there was no nearby anycast relay at that time.

If you know the right magic, you can make Windows (XP, at any rate) use
whatever outbound relay you want, but it's still host-based 6to4, and
the RFC 3056 model is router based.

netsh interface ipv6 6to4 set relay <ipv4 address goes here>

> in the case where for example your home router is the 6to4 device the
> router and not the windows stack is the involved party since  it's the
> only device with a public v4 address. watching the dlinks and some other
> devices I have they certainly do use the v4 anycast address.

Oh, you have DLINKs that do 6to4? Pray tell the model number and software version.

   Brian