<div dir="ltr"><div>Looking at your 1 repeat ORD example:</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jan 18, 2022 at 12:17 AM PAUL R BARFORD <<a href="mailto:pb@cs.wisc.edu">pb@cs.wisc.edu</a>> wrote:</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
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<span style="margin:0px;font-family:Courier">6  64.125.15.65  1.895 ms      [x] (<a href="http://zayo.telia.ter1.ord7.us.zip.zayo.com" target="_blank">zayo.telia.ter1.ord7.us.zip.zayo.com</a>., CAIDA-GEOLOC -> Chicago, IL, US)</span></p>
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<span style="margin:0px;font-family:Courier">7  62.115.118.59  99.242 ms    [x] (<a href="http://prs-b3-link.ip.twelve99.net" target="_blank">prs-b3-link.ip.twelve99.net</a>., CAIDA-GEOLOC -> Paris, FR)</span></p>
<p style="color:rgb(32,31,30);background-color:rgb(255,255,255);font-size:11pt;font-family:Calibri,sans-serif;margin:0px"><br></p></div></div></blockquote><div><br></div><div> 65.15.125.64.in-addr.arpa        name = <a href="http://zayo.telia.ter1.ord7.us.zip.zayo.com">zayo.telia.ter1.ord7.us.zip.zayo.com</a>.</div>64.15.125.64.in-addr.arpa       name = <a href="http://ae51.zayo.ter1.ord7.us.zip.zayo.com">ae51.zayo.ter1.ord7.us.zip.zayo.com</a>.<br></div><div class="gmail_quote"><br></div><div class="gmail_quote">it looks like the probes you selected (at least the depaul univ one(s)) are finding the 'best path' to whatever destinations via depaul -> zayo -> telia.</div><div class="gmail_quote">It looks like zayo/telia interconnect at that /31.</div><div class="gmail_quote">Based on:<br>  <a href="https://www.teliacarrier.com/dam/jcr:fc260a69-98a2-47d3-8d30-ca7095318413/telia-carrier-map-america-nov-2021.png">https://www.teliacarrier.com/dam/jcr:fc260a69-98a2-47d3-8d30-ca7095318413/telia-carrier-map-america-nov-2021.png</a></div><div class="gmail_quote"><br></div><div class="gmail_quote">i'd guess that:<br> 1) telia has an mpls core with no-decrement-ttl enabled</div><div class="gmail_quote"> 2) the hidden hosp include NYC and possibly cleveland/wdc</div><div class="gmail_quote"> 3) judging the path information purely on traceroute hops is error prone.</div></div>