6to4 extinction

[Brian E Carpenter]

Also, ipv6.wikiwall.org is IPv6-only on the same address. However,
judging by what's in that wiki, this has been sleeping since 2008.

It works perfectly as long as there's a working 2002::/16 relay in sight.
That seems to be 21 hops from where I'm sitting.

C:\windows\system32>tracert 2002:4a5c:3b41:1:216:3eff:fe57:7f4

Tracing route to shelob.surriel.com [2002:4a5c:3b41:1:216:3eff:fe57:7f4]
over a maximum of 30 hops:

  1     3 ms     3 ms     2 ms  gw-1489.lon-02.gb.sixxs.net [2a01:348:6:5d0::1]
  2     3 ms     3 ms     2 ms  gblon02.sixxs.net [2a01:348:0:4:0:3:1:1]
  3     3 ms     4 ms     4 ms  ge-0-0-5-20.cs0.thw.uk.goscomb.net [2a01:348:0:4:0:3:0:1]
  4     4 ms     3 ms     4 ms  xe-0-1-1.cs0.the.uk.goscomb.net [2a01:348::36:1:1]
  5     5 ms     3 ms     4 ms  xe-0-1-0.cs0.gs2.uk.goscomb.net [2a01:348::24:1:1]
  6     4 ms     4 ms     5 ms  xe-0-1-0-0.cs1.gs2.uk.goscomb.net [2a01:348::40:1:1]
  7     8 ms     3 ms     6 ms  xe-0-1-0.cs0.sov.uk.goscomb.net [2a01:348::41:1:1]
  8     3 ms     3 ms     4 ms  ge-1-1-5.rt0.sov.uk.goscomb.net [2a01:348::17:0:1]
  9     3 ms     3 ms     4 ms  ae0-700.rt0.the.uk.goscomb.net [2a01:348::32:1:1]
 10     4 ms     3 ms     4 ms  xe-0-0-3-0.rt0.thn.uk.goscomb.net [2a01:348::27:1:1]
 11    20 ms    10 ms    10 ms  2001:7f8:4::22e0:1
 12    10 ms    10 ms    10 ms  2001:1478:0:24::1
 13    10 ms    10 ms    10 ms  2001:1478:0:2a::1
 14    11 ms    10 ms    10 ms  2001:1478:0:1::2
 15    11 ms    10 ms    10 ms  2001:1478:0:2::2
 16    18 ms    17 ms    18 ms  2001:1478:0:3::2
 17    28 ms    28 ms    46 ms  2001:1478:0:20::1
 18    35 ms    29 ms    29 ms  2001:1478:0:1f::2
 19    68 ms   214 ms   216 ms  c76-3.ix1.vie.at.as39912.net [2001:1478:10:6::2]
 20    31 ms    33 ms    32 ms  c76-1.ix2.ffm.de.as39912.net [2a01:f8:1:2:1:1:4:3]
 21    30 ms    30 ms    30 ms  Tenge1-2.cr2.FRA3.content-core.net [2001:7f8::3cee:0:1]
 22   165 ms   167 ms   169 ms  mithlond.surriel.com [2002:4a5c:3b41::1]
 23   158 ms   160 ms   167 ms  shelob.surriel.com [2002:4a5c:3b41:1:216:3eff:fe57:7f4]

Trace complete.

Regards
   Brian Carpenter




On 27/11/2012 11:40, Bjørn Mork wrote:
> "Steinar H. Gunderson" <sesse at google.com> writes:
>> 2012/11/10 Ivan Shmakov <oneingray at gmail.com>:
>>>         Which makes me wonder on what are the costs of operating one's
>>>         own “IPv6-to-6to4” relay?  As it seems, the “no valid route to
>>>         192.88.99.1” case is much easier to troubleshoot that the
>>>         converse “no valid route to 2002::/16” one, so the latter may
>>>         indeed deserve some extra care.
>> It's simple; if you wish, you can add a 6to4 decapsulation on every
>> server if you wish. I've done it a few times, with a marked increase
>> in reliability to 6to4-using hosts. (Nowadays it's quite irrelevant,
>> though, since 6to4 is all but extinct.)
> 
> I stumble across this oddity from time to time, and it surprises me just
> as much every time (which of course says a lot more about my memory than
> anything else):
> 
> $ dig aaaa kernelnewbies.org
> 
> ; <<>> DiG 9.7.3 <<>> aaaa kernelnewbies.org
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2815
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 4
> 
> ;; QUESTION SECTION:
> ;kernelnewbies.org.             IN      AAAA
> 
> ;; ANSWER SECTION:
> kernelnewbies.org.      3600    IN      AAAA    2002:4a5c:3b41:1:216:3eff:fe57:7f4
> 
> ;; AUTHORITY SECTION:
> kernelnewbies.org.      3357    IN      NS      ns1.infradead.org.
> kernelnewbies.org.      3357    IN      NS      mithlond.surriel.com.
> kernelnewbies.org.      3357    IN      NS      ns1.sosdg.org.
> 
> ;; ADDITIONAL SECTION:
> ns1.infradead.org.      38346   IN      A       85.118.1.10
> ns1.infradead.org.      38346   IN      AAAA    2001:770:15f::2
> mithlond.surriel.com.   2329    IN      A       74.92.59.65
> mithlond.surriel.com.   2329    IN      AAAA    2002:4a5c:3b41:1::65
> 
> ;; Query time: 193 msec
> ;; SERVER: 127.0.0.1#53(127.0.0.1)
> ;; WHEN: Tue Nov 27 12:32:22 2012
> ;; MSG SIZE  rcvd: 237
> 
> 
> Yes, they still run dns, http and smtp services over 6to4.  Really.
> 
> Thought I'd just mention it here so that Google can find it for me the
> next time it strikes me by surprise :-)
> 
> 
> 
> Bjørn
>