Thank you for this reply<br><br>Do you know in witch RFC we can find this 'Algorithm', it seem that the cname reply with servfail is a problem for some web hosting and for DNSSTUFF<br><br><b><span style="font-size: 8.5pt; font-family: "Trebuchet MS","sans-serif"; color: red;" lang="EN-US">
<u>Server failure! [took 171 ms]. Response: Server failure</u>.
There's a problem with the DNS server for <a href="http://WWW.abcde.com">WWW.abcde.com</a>.</span></b><br><br><br><br><div><span class="gmail_quote">2007/8/10, bert hubert <<a href="mailto:bert.hubert@netherlabs.nl">
bert.hubert@netherlabs.nl</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">On Fri, Aug 10, 2007 at 07:34:51AM +0200, Hannes M. wrote:
<br>> i have some strange problem with CNAME records to an external domain.<br>> For example:<br><br>This is a commonly observed oddity of the domain name system.<br><br>Indeed, powerdns returns a 'servfail' if you ask it for
<a href="http://www3.example.com">www3.example.com</a>,<br>but it turns out that resolving nameservers ('recursors') know about that.<br><br>The reason powerdns needs to return servfail is because it cannot faithfully
<br>answer the question - it does not know about '<a href="http://www.somewhere-else.com">www.somewhere-else.com</a>', that<br>domain is 'out of its bailiwick' in DNS speak.<br><br>However, recursors get the hint and continue resolving for
<br>'<a href="http://www.somewhere-else.com">www.somewhere-else.com</a>'.<br><br>So what you observe is the 'SERVFAIL', because you did not configure<br>powerdns to resolve for you.<br><br>If you'd include a line 'recursor=
<a href="http://4.2.2.1">4.2.2.1</a>' for example, you would get a<br>complete answer, because in that case powerdns would offload the processing<br>of <a href="http://www.somewhere-else.com">www.somewhere-else.com</a>
to the configured recursor.<br><br>For <a href="http://www.example.com">www.example.com</a> this won't work as it is a fake domain, but you get the<br>idea.<br><br>> dig +norecurs <a href="http://www3.example.com">
www3.example.com</a> delivers the CNAME as stored, but PDNS<br>> does not resolve.<br><br>Well, that is as it should be.<br><br>Good luck!<br><br>--<br><a href="http://www.PowerDNS.com">http://www.PowerDNS.com</a> Open source, database driven DNS Software
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