Hi Ceki,

Thank you for your response.

It seems to be working.

Regards,

Takuma Tsutsumi

2017-03-31 14:09 GMT+09:00 Ceki Gulcu <ceki@qos.ch>:

I am afraid there is not much I can do regarding the DNS queries since the provider for the host which does not have an AAAA record does not support IPv6. Anyway, the router/IPv6 and the Apache/IPv6 issues have been fixed.

Even http://ready.chair6.net/?url=https://logback.qos.ch seems happy.


Best regards,

--
Ceki

On 3/30/2017 9:25 PM, Ceki Gulcu wrote:

Hi Takuma,


There were multiple issues involved.

1) There was a router issue which dropped all IPv6 packets.
2) there are two DNS servers for the qos.ch domain. They are configured
differently.
3) There is indeed an APache configuration problem which I am trying to
identify.

--
Ceki


On 3/30/2017 6:52 AM, Takuma Tsutsumi wrote:

Hi,

If using a user-agent that prefer IPv6 such as the Squid proxy, a
timeout may frequently occur on logback.qos.ch <http://logback.qos.ch>.

It seems to me that the IPv6 site does not exist.
 References:
  - http://ready.chair6.net/?url=https://logback.qos.ch
<http://ready.chair6.net/?url=https://logback.qos.ch>
  - http://ipv6-test.com/validate.php <http://ipv6-test.com/validate.php>

In addition, it seems that AAAA records may not be returned depending on
DNS query timing.
```
$ date; dig +noall +answer @8.8.8.8 <http://8.8.8.8> logback.qos.ch
<http://logback.qos.ch> aaaa
Thu Mar 30 22:34:03 DST 2017
logback.qos.ch <http://logback.qos.ch>.         279     IN      CNAME
yvo.qos.ch <http://yvo.qos.ch>.
yvo.qos.ch <http://yvo.qos.ch>.             279     IN      AAAA
 2a02:121e:969:1:201:c0ff:fe1c:5f7c

$ date; dig +noall +answer @8.8.8.8 <http://8.8.8.8> logback.qos.ch
<http://logback.qos.ch> aaaa
Thu Mar 30 22:34:05 DST 2017
logback.qos.ch <http://logback.qos.ch>.         299     IN      CNAME
te.qos.ch <http://te.qos.ch>.
```

Would you please investigate this?

Regards,

Takuma Tsutsumi



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