<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Mar 6, 2013, at 20:33, Paul Vixie wrote:</div><blockquote type="cite"><div text="#000000" bgcolor="#FFFFFF">if the authority server in question is configured to be a primary or
secondary server for a zone which is at or above the qname, then the
correct answer is either authoritative-positive, authoritative-negative,
or servfail.<br></div></blockquote><div><br></div>Or a non-authoritative referral but then again there's also FROMERR and come to think of it other results involving CNAME, DNAME and even a wildcard match.</div><div><br></div><div>I have over time tried to come up with a state machine description of what DNS returns but never could complete the task. The protocol is too hap-hazzard in architecture to be nicely reverse engineered. Sigh.<br><br><blockquote type="cite"><div text="#000000" bgcolor="#FFFFFF">
if said authoritity server is not configured to be a primary or
secondary for any zone at or above the qname, then the proper response
is refused. (not an upward delegation as a i once had it in bind8 -- my
apologies to all.)<br></div></blockquote><div><br></div>We chose SERVFAIL instead of REFUSED for that - in the sense that the service failed by sending the querier to the wrong place. I don't think either is better than the other, just saying this because it's not always clear what's the right RCODE.</div><div><br></div><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; ">-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=<span></span>-=-=-=-<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>Edward Lewis <span></span> <br>NeuStar <span></span> You can leave a voice message at +1-571-434-5468<br><br>There are no answers - just tradeoffs, decisions, and responses.</div></div></div></span></span>
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