<div dir="ltr"><div>Hi Ceki,</div><div><br></div><div>Thank you for your response.</div><div>It seems to be working.</div><div><br></div><div>Regards,</div><div><br></div><div>Takuma Tsutsumi</div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">2017-03-31 14:09 GMT+09:00 Ceki Gulcu <span dir="ltr"><<a href="mailto:ceki@qos.ch" target="_blank">ceki@qos.ch</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<br>
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.<br>
<br>
Even <a href="http://ready.chair6.net/?url=https://logback.qos.ch" rel="noreferrer" target="_blank">http://ready.chair6.net/?url=h<wbr>ttps://logback.qos.ch</a> seems happy.<br>
<br>
<br>
Best regards,<br>
<br>
--<br>
Ceki<div class="gmail-HOEnZb"><div class="gmail-h5"><br>
<br>
On 3/30/2017 9:25 PM, Ceki Gulcu wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Hi Takuma,<br>
<br>
<br>
There were multiple issues involved.<br>
<br>
1) There was a router issue which dropped all IPv6 packets.<br>
2) there are two DNS servers for the <a href="http://qos.ch" rel="noreferrer" target="_blank">qos.ch</a> domain. They are configured<br>
differently.<br>
3) There is indeed an APache configuration problem which I am trying to<br>
identify.<br>
<br>
--<br>
Ceki<br>
<br>
<br>
On 3/30/2017 6:52 AM, Takuma Tsutsumi wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Hi,<br>
<br>
If using a user-agent that prefer IPv6 such as the Squid proxy, a<br>
timeout may frequently occur on <a href="http://logback.qos.ch" rel="noreferrer" target="_blank">logback.qos.ch</a> <<a href="http://logback.qos.ch" rel="noreferrer" target="_blank">http://logback.qos.ch</a>>.<br>
<br>
It seems to me that the IPv6 site does not exist.<br>
References:<br>
- <a href="http://ready.chair6.net/?url=https://logback.qos.ch" rel="noreferrer" target="_blank">http://ready.chair6.net/?url=h<wbr>ttps://logback.qos.ch</a><br>
<<a href="http://ready.chair6.net/?url=https://logback.qos.ch" rel="noreferrer" target="_blank">http://ready.chair6.net/?url=<wbr>https://logback.qos.ch</a>><br>
- <a href="http://ipv6-test.com/validate.php" rel="noreferrer" target="_blank">http://ipv6-test.com/validate.<wbr>php</a> <<a href="http://ipv6-test.com/validate.php" rel="noreferrer" target="_blank">http://ipv6-test.com/validate<wbr>.php</a>><br>
<br>
In addition, it seems that AAAA records may not be returned depending on<br>
DNS query timing.<br>
```<br>
$ date; dig +noall +answer @<a href="http://8.8.8.8" rel="noreferrer" target="_blank">8.8.8.8</a> <<a href="http://8.8.8.8" rel="noreferrer" target="_blank">http://8.8.8.8</a>> <a href="http://logback.qos.ch" rel="noreferrer" target="_blank">logback.qos.ch</a><br>
<<a href="http://logback.qos.ch" rel="noreferrer" target="_blank">http://logback.qos.ch</a>> aaaa<br>
Thu Mar 30 22:34:03 DST 2017<br>
<a href="http://logback.qos.ch" rel="noreferrer" target="_blank">logback.qos.ch</a> <<a href="http://logback.qos.ch" rel="noreferrer" target="_blank">http://logback.qos.ch</a>>. 279 IN CNAME<br>
<a href="http://yvo.qos.ch" rel="noreferrer" target="_blank">yvo.qos.ch</a> <<a href="http://yvo.qos.ch" rel="noreferrer" target="_blank">http://yvo.qos.ch</a>>.<br>
<a href="http://yvo.qos.ch" rel="noreferrer" target="_blank">yvo.qos.ch</a> <<a href="http://yvo.qos.ch" rel="noreferrer" target="_blank">http://yvo.qos.ch</a>>. 279 IN AAAA<br>
2a02:121e:969:1:201:c0ff:<wbr>fe1c:5f7c<br>
<br>
$ date; dig +noall +answer @<a href="http://8.8.8.8" rel="noreferrer" target="_blank">8.8.8.8</a> <<a href="http://8.8.8.8" rel="noreferrer" target="_blank">http://8.8.8.8</a>> <a href="http://logback.qos.ch" rel="noreferrer" target="_blank">logback.qos.ch</a><br>
<<a href="http://logback.qos.ch" rel="noreferrer" target="_blank">http://logback.qos.ch</a>> aaaa<br>
Thu Mar 30 22:34:05 DST 2017<br>
<a href="http://logback.qos.ch" rel="noreferrer" target="_blank">logback.qos.ch</a> <<a href="http://logback.qos.ch" rel="noreferrer" target="_blank">http://logback.qos.ch</a>>. 299 IN CNAME<br>
<a href="http://te.qos.ch" rel="noreferrer" target="_blank">te.qos.ch</a> <<a href="http://te.qos.ch" rel="noreferrer" target="_blank">http://te.qos.ch</a>>.<br>
```<br>
<br>
Would you please investigate this?<br>
<br>
Regards,<br>
<br>
Takuma Tsutsumi<br>
<br>
<br>
<br>
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<br>
</blockquote>
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</blockquote>
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<a href="http://mailman.qos.ch/mailman/listinfo/logback-user" rel="noreferrer" target="_blank">http://mailman.qos.ch/mailman/<wbr>listinfo/logback-user</a></div></div></blockquote></div><br></div></div>