[logback-user] Timeout may frequently occurred on logback.qos.ch [IPv6]

[Ceki Gulcu]

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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>> logback-user at qos.ch
>> http://mailman.qos.ch/mailman/listinfo/logback-user
>>
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