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justbits
More fiber than ATT can handle
Premium
join:2003-01-08
Chicago, IL
Reviews:
·Comcast Business..

AT&T IPv6 6to4 is broken

»AT&T IPv6 6to4 is broken

Been broken for a while now. I would bet this is just the first step toward monetizing IPv6 static IP addressing. Why? If you had a static IPv4 address, 6to4 gives you a static IPv6 address.



graysonf
Premium,MVM
join:1999-07-16
Fort Lauderdale, FL
kudos:2

You can get a tunneled static IPV6 netblock from Hurricane Electric. It's yours as long as you want it and it's free.



Cabal
Premium
join:2007-01-21
Reviews:
·Suddenlink

said by graysonf:

You can get a tunneled static IPV6 netblock from Hurricane Electric. It's yours as long as you want it and it's free.

Seconded.

»tunnelbroker.net/
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If you can't open it, you don't own it.


leibold
Premium,MVM
join:2002-07-09
Sunnyvale, CA
kudos:10
Reviews:
·SONIC.NET
reply to justbits

I have added a post to the original topic in the AT&T Midwest forum with my test results.

I'm not sure whether the speculated reasons for the change are correct. I'm more inclined to think that AT&T is reconfiguring those 6to4 relays for their Uverse residential Internet users. Uverse customers are supposed to get IPv6 using CGN and 6rd (which is 6to4 based). This may mean that AT&T customers that are not on the 10.x.x.x network that AT&T is creating for that purpose are unable (or no longer able) to access those 6to4 relays.
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whfsdude
Premium
join:2003-04-05
Washington, DC
Reviews:
·Comcast

6to4 is being depreciated and won't work behind CGN anyway. IMO, 6to4 actually leads to brokenness on the internet.

Sign up for a static tunnel. If you just want a single PC, I'd recommend going with a sixxs.net tunnel and using AYIYA as it works behind multiple layers of NAT.



dahan

join:2000-10-25
Leander, TX
reply to justbits

What's the advantage of 6to4 now that AT&T provides 6rd? It has the same characteristic that if you have a static IPv4, 6rd gives you a static IPv6 prefix.



leibold
Premium,MVM
join:2002-07-09
Sunnyvale, CA
kudos:10
Reviews:
·SONIC.NET

2 recommendations

said by dahan:

What's the advantage of 6to4 now that AT&T provides 6rd?

There isn't any, 6rd is an improved form of 6to4. In 6to4 the IPv6 prefix is globally shared while in 6rd the IPv6 prefix is specific to the ISP (in this case AT&T). This makes routing more predictable and reliable.

However it is not clear whether all customers that were previously able to use AT&T 6to4 relays will also be included in the upcoming 6rd deployment. From the news articles it sounds as if the 6rd deployment will be for uverse customers only.
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dahan

join:2000-10-25
Leander, TX

3 recommendations

said by leibold:

However it is not clear whether all customers that were previously able to use AT&T 6to4 relays will also be included in the upcoming 6rd deployment. From the news articles it sounds as if the 6rd deployment will be for uverse customers only.

From what I've read, anyone can use AT&T's 6rd relays. While I didn't set up a full tunnel, I've confirmed that a ping6 from a (non-AT&T) machine with a he.net tunnel to another (non-AT&T) machine's AT&T 6rd address shows incoming encapsulated IPv6 echo request packets from IPv4 address 12.83.49.81 (AT&T's 6rd gateway). So if it works with two machines that are both on non-AT&T networks, it seems like it should work for AT&T DSL too. This post also claims that AT&T's 6rd works on AT&T legacy DSL.

Now it's certainly possible (likely?) that AT&T won't be configuring 6rd for DSL customers, but it doesn't sound like the original poster needs AT&T to do the config for him since he's capable of doing his own 6to4 config.

So, I can see being annoyed that a previously-working 6to4 setup is now broken, and I don't know why it no longer works; but on the other hand, I'm not seeing why it's really a big deal. Just switch to 6rd and get lower latency/faster speeds.


leibold
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join:2002-07-09
Sunnyvale, CA
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Reviews:
·SONIC.NET

1 recommendation

said by dahan:

So, I can see being annoyed that a previously-working 6to4 setup is now broken, and I don't know why it no longer works; but on the other hand, I'm not seeing why it's really a big deal.

100% agreed. I did some experimenting with IPv6 last year and found 6to4 (not AT&T) very frustrating (things would work one moment and not the next or only work after repeated tries).

I found the 6in4 tunnels provided by HE.net and Sonic.net just as easy to setup and very reliable.

Thanks for the link to the AT&T 6rd discussions. If I find the time I'll give that a try.
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justbits
More fiber than ATT can handle
Premium
join:2003-01-08
Chicago, IL
Reviews:
·Comcast Business..

1 recommendation

reply to dahan

Thanks for pointing out the 6rd post. I should've searched harder to find that info. As an alternative to 6to4, I have been using tunnelbroker.net and now I have 6rd working. Thanks!

I have completely abandoned all hope for 6to4 now that I realize that AT&T 6rd is good enough and works as I'd expect it to.

Also, it looks like the way 6rd is configured today, AT&T isn't going to monetize 6rd IPv6 addressing any more than how they monetize static IPv4 today. Technically, they could always remove the one to one mapping of IPv4 addresses encoded within the 6rd host address, in order to monetize IPv6 via 6rd. But, I hope they won't do that.



justbits
More fiber than ATT can handle
Premium
join:2003-01-08
Chicago, IL

Does anyone know how AT&T is going to handle reverse IPv6 DNS delegation for those of us who have static IPv4 addresses? I'm contacting prov-dns@att.net to see if they have any details.

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