<div dir="ltr"><div style="font-size:14.9438px;font-family:sans-serif">In Appendic A1.1 of <a href="http://downloads.powerdns.com/documentation/pdns.pdf" target="_top" rel="nofollow" link="external">http://downloads.powerdns.com/documentation/pdns.pdf</a> it does say that there are three forms of Questions.<br></div><div style="font-size:14.9438px;font-family:sans-serif"><br>A.1.1.2</div><div style="font-size:14.9438px;font-family:sans-serif"> Questions</div><div style="font-size:16.6043px;font-family:sans-serif">Questions come in three forms and are prefixed by a tag indicating the type:</div><div style="font-size:16.6043px;font-family:sans-serif">Q Regular queries</div><div style="font-size:16.6043px;font-family:sans-serif">AXFR List requests, which mean that an entire zone should be listed</div><div style="font-size:16.6043px;font-family:sans-serif">PING Check if the coprocess is functioning</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 26, 2015 at 9:30 AM, Christian Hofstaedtler [via PowerDNS] <span dir="ltr"><<a href="/user/SendEmail.jtp?type=node&node=11343&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>></span> wrote:<br><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div class='shrinkable-quote'><br>> On 26 Feb 2015, at 08:11, xxsyys <<a href="http:///user/SendEmail.jtp?type=node&node=11342&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>> wrote:
<br>>
<br>> Hi,
<br>>
<br>> I am implementing a pipe backend for pdns.
<br>>
<br>> What is the proper response to the "PING" command? The documentation at
<br>> <a href="https://doc.powerdns.com/md/authoritative/backend-pipe/#pipebackend-protocol" rel="nofollow" link="external" target="_blank">https://doc.powerdns.com/md/authoritative/backend-pipe/#pipebackend-protocol</a><br>> does not say.
<br>>
<br>> I would assume it is "PONG" but the list of acceptable answer tags does not
<br>> contain PONG, leading me to belive it would be either just
<br>> END
<br>> or
<br>> DATA\tPONG
<br>> END
</div></div>The documentation says nothing about a reply to PING, because it doesn’t say anything about PING in the first place.
<br><br>PING is not a command/query for pipebackend coprocesses.
<br><br><br>--
<br>Christian Hofstaedtler / Deduktiva GmbH (FN 418592 b, HG Wien)
<br><a href="http://www.deduktiva.com" target="_blank" rel="nofollow" link="external">www.deduktiva.com</a> / <a href="tel:%2B43%201%20353%201707" value="+4313531707" target="_blank">+43 1 353 1707</a>
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