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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>And furthermore, it is my understanding that in RRL no queries are ever discarded. Only the response is throttled.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Alan V. Shackelford Senior Systems Software Engineer<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The Johns Hopkins University and Johns Hopkins Medical Institutions<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Baltimore, Maryland USA <a href="mailto:ashackel@jhmi.edu"><span style='color:#0563C1'>ashackel@jhmi.edu</span></a> 410-735-4773<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext'> dns-operations-bounces@lists.dns-oarc.net [mailto:dns-operations-bounces@lists.dns-oarc.net] <b>On Behalf Of </b>Paul Vixie<br><b>Sent:</b> Wednesday, August 21, 2013 12:43 PM<br><b>To:</b> Vernon Schryver<br><b>Cc:</b> dns-operations@lists.dns-oarc.net<br><b>Subject:</b> Re: [dns-operations] Geoff Huston on DNS-over-TCP-only study.<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><br><br>Vernon Schryver wrote: <o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre><a href="http://www.circleid.com/posts/20130820_a_question_of_dns_protocols">http://www.circleid.com/posts/20130820_a_question_of_dns_protocols</a><o:p></o:p></pre><pre>disappointed me with this characterization of RRL:<o:p></o:p></pre><pre><o:p> </o:p></pre><pre> There is a conversation thread that says that resolvers should<o:p></o:p></pre><pre> implement response rate limiting (RRL), and silently discard<o:p></o:p></pre><pre> repetitive queries that exceed some locally configured threshold.<o:p></o:p></pre></blockquote><p class=MsoNormal><br>that wording did not leap out at me at the time, but, is factually wrong. RRL is on the server side not the resolver side.<span style='font-family:"Courier New"'><br><br>vixie<br><br></span><o:p></o:p></p><pre><o:p> </o:p></pre></div></body></html>