<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear list,<div class=""><br class=""></div><div class="">I recently found a ‘weird’ traceroute measurement record in the sense that:</div><div class=""><ul class=""><li class="">with paris id set, it has different IP addresses for a given hop;</li><li class="">after it reached the destination, it tried one more hop;</li><li class="">the final hop reported abnormally small RTT.</li></ul></div><div class=""><br class=""></div><div class="">I’d appreciate your views on how this happened.</div><div class=""><br class=""></div><div class="">Here is how to identify the measurement in question: (the concerned record is as well provided at the end the mail) </div><div class=""><pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Menlo';font-size:9.0pt;" class=""><span style="color:#cc7832;font-weight:bold;" class="">from </span>ripe.atlas.cousteau <span style="color:#cc7832;font-weight:bold;" class="">import </span>AtlasResultsRequest<br class="">filters = <span style="color:#8888c6;" class="">dict</span>(<span style="color:#aa4926;" class="">msm_id</span>=<span style="color:#6897bb;" class="">5010</span><span style="color:#cc7832;" class="">, </span><span style="color:#aa4926;" class="">probe_ids</span>=[<span style="color:#6897bb;" class="">10460</span>]<span style="color:#cc7832;" class="">, </span><span style="color:#aa4926;" class="">start</span>=<span style="color:#6897bb;" class="">1482177890</span><span style="color:#cc7832;" class="">, </span><span style="color:#aa4926;" class="">stop</span>=<span style="color:#6897bb;" class="">1482177900</span>)<br class="">_<span style="color:#cc7832;" class="">, </span>results = AtlasResultsRequest(**filters).create()</pre><div class="">It’s a IPv4 traceroute measurement toward DNS b root, 192.228.79.201.</div><div class="">What you’ll see is:</div></div><div class="">starting from hop 14, the 3 measurements for the same hop come from different IP address:</div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class="">hop 14: 184.105.80.202, 72.52.92.122</div><div class="">hop 15: 72.52.92.122, 216.218.223.28</div><div class="">hop 16: 216.218.223.28, 130.152.181.189</div><div class="">hop 17: 130.152.181.189, 206.117.5.22</div><div class="">hop 18: 206.117.5.22, 192.228.79.201</div><div class="">hop 19: 192.228.79.201</div></blockquote><div class=""><br class=""></div><div class="">My first doubt is with Paris traceroute is it still possible that response IP can change due to LB mechanism on the returning path?</div><div class=""><br class=""></div><div class="">At hop 18, the traceroute actually already reached the destination, but it continued to perform the hop 19, why?</div><div class=""><br class=""></div><div class="">At hop 19, there is one measurement from 192.228.79.201 reporting abnormally small RTT of 0.449ms. How come? Can that happen to other measurements as well, under what circumstances?</div><div class=""><br class=""></div><div class="">The above listed neighbouring hops always share one IP address, which makes it seem like a data formatting issue. Is there a known bug?</div><div class=""><br class=""></div><div class="">Thanks in advance for your attention.</div><div class=""><br class=""></div><div class="">Best regards,</div><div class="">wenqin</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Here below the measurement in question:</div><div class="">====</div><div class=""><div class=""><font face="Geneva" size="1" class="">[</font></div><div class=""><font face="Geneva" size="1" class="">   {</font></div><div class=""><font face="Geneva" size="1" class="">      "lts":-1,</font></div><div class=""><font face="Geneva" size="1" class="">      "size":40,</font></div><div class=""><font face="Geneva" size="1" class="">      "from":"176.227.133.141",</font></div><div class=""><font face="Geneva" size="1" class="">      "dst_name":"192.228.79.201",</font></div><div class=""><font face="Geneva" size="1" class="">      "fw":4740,</font></div><div class=""><font face="Geneva" size="1" class="">      "proto":"UDP",</font></div><div class=""><font face="Geneva" size="1" class="">      "af":4,</font></div><div class=""><font face="Geneva" size="1" class="">      "msm_name":"Traceroute",</font></div><div class=""><font face="Geneva" size="1" class="">      "prb_id":10460,</font></div><div class=""><font face="Geneva" size="1" class="">      "result":[</font></div><div class=""><font face="Geneva" size="1" class="">         {</font></div><div class=""><font face="Geneva" size="1" class="">            "result":[</font></div><div class=""><font face="Geneva" size="1" class="">               {</font></div><div class=""><font face="Geneva" size="1" class="">                  "rtt":0.533,</font></div><div class=""><font face="Geneva" size="1" class="">                  "ttl":255,</font></div><div class=""><font face="Geneva" size="1" class="">                  "from":"192.168.1.1",</font></div><div class=""><font face="Geneva" size="1" class="">                  "size":28</font></div><div class=""><font face="Geneva" size="1" class="">               },</font></div><div class=""><font face="Geneva" size="1" class="">               {</font></div><div class=""><font face="Geneva" size="1" class="">                  "rtt":0.418,</font></div><div class=""><font face="Geneva" size="1" class="">                  "ttl":255,</font></div><div class=""><font face="Geneva" size="1" class="">                  "from":"192.168.1.1",</font></div><div class=""><font face="Geneva" size="1" class="">                  "size":28</font></div><div class=""><font face="Geneva" size="1" class="">               },</font></div><div class=""><font face="Geneva" size="1" class="">               {</font></div><div class=""><font face="Geneva" size="1" class="">                  "rtt":0.405,</font></div><div class=""><font face="Geneva" size="1" class="">                  "ttl":255,</font></div><div class=""><font face="Geneva" size="1" class="">                  "from":"192.168.1.1",</font></div><div class=""><font face="Geneva" size="1" class="">                  "size":28</font></div><div class=""><font face="Geneva" size="1" class="">               }</font></div><div class=""><font face="Geneva" size="1" class="">            ],</font></div><div class=""><font face="Geneva" size="1" class="">            "hop":1</font></div><div class=""><font face="Geneva" size="1" class="">         },</font></div><div class=""><font face="Geneva" size="1" class="">         {</font></div><div class=""><font face="Geneva" size="1" class="">            "result":[</font></div><div class=""><font face="Geneva" size="1" class="">               {</font></div><div class=""><font face="Geneva" size="1" class="">                  "x":"*"</font></div><div class=""><font face="Geneva" size="1" class="">               },</font></div><div class=""><font face="Geneva" size="1" class="">               {</font></div><div class=""><font face="Geneva" size="1" class="">                  "x":"*"</font></div><div class=""><font face="Geneva" size="1" class="">               },</font></div><div class=""><font face="Geneva" size="1" class="">               {</font></div><div class=""><font face="Geneva" size="1" class="">                  "x":"*"</font></div><div class=""><font face="Geneva" size="1" class="">               }</font></div><div class=""><font face="Geneva" size="1" class="">            ],</font></div><div class=""><font face="Geneva" size="1" class="">            "hop":2</font></div><div class=""><font face="Geneva" size="1" class="">         },</font></div><div class=""><font face="Geneva" size="1" class="">         {</font></div><div class=""><font face="Geneva" size="1" class="">            "result":[</font></div><div class=""><font face="Geneva" size="1" class="">               {</font></div><div class=""><font face="Geneva" size="1" class="">                  "rtt":677.27,</font></div><div class=""><font face="Geneva" size="1" class="">                  "ttl":253,</font></div><div class=""><font face="Geneva" size="1" class="">                  "from":"10.130.162.13",</font></div><div class=""><font face="Geneva" size="1" class="">                  "size":28</font></div><div class=""><font face="Geneva" size="1" class="">               },</font></div><div class=""><font face="Geneva" size="1" class="">               {</font></div><div class=""><font face="Geneva" size="1" class="">                  "rtt":660.216,</font></div><div class=""><font face="Geneva" size="1" class="">                  "ttl":253,</font></div><div class=""><font face="Geneva" size="1" class="">                  "from":"10.130.162.13",</font></div><div class=""><font face="Geneva" size="1" class="">                  "size":28</font></div><div class=""><font face="Geneva" size="1" class="">               },</font></div><div class=""><font face="Geneva" size="1" class="">               {</font></div><div class=""><font face="Geneva" size="1" class="">                  "rtt":709.112,</font></div><div class=""><font face="Geneva" size="1" class="">                  "ttl":253,</font></div><div class=""><font face="Geneva" size="1" class="">                  "from":"10.130.162.13",</font></div><div class=""><font face="Geneva" size="1" class="">                  "size":28</font></div><div class=""><font face="Geneva" size="1" class="">               }</font></div><div class=""><font face="Geneva" size="1" class="">            ],</font></div><div class=""><font face="Geneva" size="1" class="">            "hop":3</font></div><div class=""><font face="Geneva" size="1" class="">         },</font></div><div class=""><font face="Geneva" size="1" class="">         {</font></div><div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