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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks for the information. It seems to me that the comparison on failures between TCP and UDP make no sense at this moment. <o:p></o:p></span></p><p class=MsoNormal><a name="_MailEndCompose"><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></a></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>Davey<o:p></o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt'>发件人<span lang=EN-US>:</span></span></b><span lang=EN-US style='font-size:10.0pt'> ripe-atlas [mailto:ripe-atlas-bounces@ripe.net] </span><b><span style='font-size:10.0pt'>代表 </span></b><span lang=EN-US style='font-size:10.0pt'>Tom<br></span><b><span style='font-size:10.0pt'>发送时间<span lang=EN-US>:</span></span></b><span lang=EN-US style='font-size:10.0pt'> 2017</span><span style='font-size:10.0pt'>年<span lang=EN-US>5</span>月<span lang=EN-US>9</span>日<span lang=EN-US> 16:33<br></span><b>收件人<span lang=EN-US>:</span></b><span lang=EN-US> ripe-atlas@ripe.net<br></span><b>主题<span lang=EN-US>:</span></b><span lang=EN-US> Re: [atlas] Many timeout-failures for DNS over TCP<o:p></o:p></span></span></p></div></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><div><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>For reference, it still appears on <a href="https://atlas.ripe.net/" target="_blank">https://atlas.ripe.net/</a> for me -<br><br><img border=0 width=32 height=32 id="_x0000_i1025" src="cid:7e511365feaed44dd594db7c282b017a"><br><br>Tom<br><br>May 9, 2017 9:14 AM, <a href="mailto:w.b.devries@utwente.nl" target="_blank">w.b.devries@utwente.nl</a> wrote:<o:p></o:p></span></p><div><div><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>Hi Davey,<o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>There used to be a message on the atlas.ripe.net frontpage, I retrieved it from google cache:<o:p></o:p></span></p><p style='margin-bottom:9.0pt;background:#F9F9F9;box-sizing: border-box'><span lang=EN-US style='font-size:10.5pt;font-family:"Open Sans","sans-serif";color:#333333'>Due to an unfortunate bug in a recent probe firmware (version 4760), TCP based DNS measurements are not providing correct results. This affects all ongoing and one-off measurements.<o:p></o:p></span></p><p style='margin-bottom:9.0pt;background:#F9F9F9;box-sizing: border-box'><span lang=EN-US style='font-size:10.5pt;font-family:"Open Sans","sans-serif";color:#333333'>The issue also affected DNSMON measurements between 14-23 March. On 23 March we deployed a corrected firmware on RIPE Atlas anchors (version 4770), and in the near future we'll deploy it on regular probes as well.<o:p></o:p></span></p><p style='margin-bottom:9.0pt;background:#F9F9F9;box-sizing: border-box'><span lang=EN-US style='font-size:10.5pt;font-family:"Open Sans","sans-serif";color:#333333'>Our excuses for the inconvenience caused!<o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>So any probe that is still on version 4760 will provide timeouts for TCP DNS lookups.<o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>Cheers,<o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:black'>Wouter<o:p></o:p></span></p><div><div class=MsoNormal align=center style='text-align:center;background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'><hr size=2 width="98%" align=center></span></div><div><p class=MsoNormal style='background:white'><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'> ripe-atlas <<a href="mailto:ripe-atlas-bounces@ripe.net" target="_blank">ripe-atlas-bounces@ripe.net</a>> on behalf of Davey Song($BAWNS7r(B) <<a href="mailto:ljsong@biigroup.cn" target="_blank">ljsong@biigroup.cn</a>><br><b>Sent:</b> Tuesday, May 9, 2017 10:03 AM<br><b>To:</b> <a href="mailto:ripe-atlas@ripe.net" target="_blank">ripe-atlas@ripe.net</a><br><b>Subject:</b> [atlas] Many timeout-failures for DNS over TCP</span><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'><o:p></o:p></span></p></div><div><div><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'>Hi folks, <o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'>I setup measurements for DNS queries over both TCP and UDP. I found the timeout and failures of TCP is far more than UDP. <o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'>For example :<o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'>DNS over TCP: <a href="https://atlas.ripe.net/measurements/8552847/#!probes" target="_blank">https://atlas.ripe.net/measurements/8552847/#!probes</a><o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'>DNS over UDP: <a href="https://atlas.ripe.net/measurements/8552846/#!probes" target="_blank">https://atlas.ripe.net/measurements/8552846/#!probes</a> <o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'>Is it normal ? I mean is there any special timeout routine/parameters of atlas probes from normal resolver?<o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'>Best regards,<o:p></o:p></span></p><p style='background:white'><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#212121'>Davey<o:p></o:p></span></p></div></div></div></div></div><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br><br><o:p></o:p></span></p></div></div></div></body></html>