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

[Ceki Gulcu]

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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