<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Sep 28, 2015 at 6:57 AM, Thomas Schäfer <span dir="ltr"><<a href="mailto:thomas@cis.uni-muenchen.de" target="_blank">thomas@cis.uni-muenchen.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I am observing sometimes very strange ipv6-misconfigurations.<br>
<br>
The last two examples are:<br>
<br>
<br>
<a href="http://www.hs-worms.de" rel="noreferrer" target="_blank">www.hs-worms.de</a><br>
<br>
LANG=C wget -6 <a href="http://www.hs-worms.de" rel="noreferrer" target="_blank">www.hs-worms.de</a><br>
converted '<a href="http://www.hs-worms.de" rel="noreferrer" target="_blank">http://www.hs-worms.de</a>' (ANSI_X3.4-1968) -> '<a href="http://www.hs-worms.de" rel="noreferrer" target="_blank">http://www.hs-worms.de</a>' (UTF-8)<br>
--2015-09-28 15:07:07-- <a href="http://www.hs-worms.de/" rel="noreferrer" target="_blank">http://www.hs-worms.de/</a><br>
Resolving <a href="http://www.hs-worms.de" rel="noreferrer" target="_blank">www.hs-worms.de</a> (<a href="http://www.hs-worms.de" rel="noreferrer" target="_blank">www.hs-worms.de</a>)... 2001:4c80:81:a000::1d<br>
Connecting to <a href="http://www.hs-worms.de" rel="noreferrer" target="_blank">www.hs-worms.de</a> (<a href="http://www.hs-worms.de" rel="noreferrer" target="_blank">www.hs-worms.de</a>)|2001:4c80:81:a000::1d|:80... failed: Connection timed out.<br>
Retrying.<br>
<br>
and<br>
<br>
<a href="http://www.df.eu" rel="noreferrer" target="_blank">www.df.eu</a><br>
<br>
LANG=C wget -6 <a href="http://www.df.eu" rel="noreferrer" target="_blank">www.df.eu</a><br>
converted '<a href="http://www.df.eu" rel="noreferrer" target="_blank">http://www.df.eu</a>' (ANSI_X3.4-1968) -> '<a href="http://www.df.eu" rel="noreferrer" target="_blank">http://www.df.eu</a>' (UTF-8)<br>
--2015-09-28 15:06:56-- <a href="http://www.df.eu/" rel="noreferrer" target="_blank">http://www.df.eu/</a><br>
Resolving <a href="http://www.df.eu" rel="noreferrer" target="_blank">www.df.eu</a> (<a href="http://www.df.eu" rel="noreferrer" target="_blank">www.df.eu</a>)... 2a00:1158:0:100::26<br>
Connecting to <a href="http://www.df.eu" rel="noreferrer" target="_blank">www.df.eu</a> (<a href="http://www.df.eu" rel="noreferrer" target="_blank">www.df.eu</a>)|2a00:1158:0:100::26|:80... failed: Connection refused.<br>
<br>
Both examples have an AAAA-record and so my assumption also IPv6.<br>
<br>
<br>
The webmaster of hs-worms doesn't answer.<br>
<br>
The webmaster of df I did not ask yet - he is a "hoster" and should have some monitoring tools.<br>
<br>
<br>
My question: Is it right, that all these misconfigurations will fail on ISPs using DNS64/NAT64, except the people using 464xlat additionally?<br>
<br>
<br></blockquote><div><br></div><div>For an IPv6-only device, it will only try IPv6...there is no fall back to IPv4.</div><div><br></div><div>So, the device will only ask for aaaa ever... it will never as for "a" record</div><div><br></div><div>Since a natural "AAAA" exists, the DNS64 will never send back a synthesize "AAAA" to the IPv6 only user.</div><div><br></div><div>So, for IPv6-only users, they will not have any access to a site with broken ipv6.</div><div><br></div><div>Generally speaking, it is better to have no IPv6 access than broken IPv6.</div><div><br></div><div>CB</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
If somebody knows the responsible persons...<br>
<br>
<br>
Regards,<br>
Thomas Schäfer<span class="HOEnZb"><font color="#888888"><br>
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-- <br>
<br>
There’s no place like ::1<br>
<br>
Thomas Schäfer (Systemverwaltung)<br>
Ludwig-Maximilians-Universität<br>
Centrum für Informations- und Sprachverarbeitung<br>
Oettingenstraße 67 Raum C109<br>
80538 München ☎ <a href="tel:%2B49%2F89%2F2180-9706" value="+498921809706" target="_blank">+49/89/2180-9706</a> ℻ <a href="tel:%2B49%2F89%2F2180-9701" value="+498921809701" target="_blank">+49/89/2180-9701</a><br>
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