<div dir="ltr">"company-ic" and "company-gw" are commonly used names for /30s used for interconnection to a customer or another carrier. Those routers are likely owned/managed by Telia/Verizon.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Apr 16, 2019 at 8:54 AM Pengxiong Zhu <<a href="mailto:pzhu011@ucr.edu">pzhu011@ucr.edu</a>> wrote:<br></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 dir="ltr"><span class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-im"><font color="#000000"><span class="gmail-m_-5609900448298310016gmail-im"><div><div dir="ltr" style="color:rgb(34,34,34)"><span class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-im"><font color="#000000"><span class="gmail-m_-5609900448298310016gmail-im"><div>Howdy folks,</div><div dir="ltr"><br></div><div dir="ltr">We are a group of researchers at UC Riverside conducting some measurement about transnational networks. In particular, we are interested in studying the ownership of routers on the two sides of transnational links. </div><div dir="ltr"><br></div><div dir="ltr">We have some concrete questions which we hope someone can shed some light on. <span class="gmail-m_-5609900448298310016gmail-gr_ gmail-m_-5609900448298310016gmail-gr_30 gmail-m_-5609900448298310016gmail-gr-alert gmail-m_-5609900448298310016gmail-gr_gramm gmail-m_-5609900448298310016gmail-gr_inline_cards gmail-m_-5609900448298310016gmail-gr_run_anim gmail-m_-5609900448298310016gmail-Punctuation gmail-m_-5609900448298310016gmail-only-ins gmail-m_-5609900448298310016gmail-replaceWithoutSep" id="gmail-m_-5609900448298310016gmail-30" style="display:inline;border-bottom:2px solid transparent;background-repeat:no-repeat;color:inherit;font-size:inherit"><span class="gmail-m_-5609900448298310016gmail-gr_ gmail-m_-5609900448298310016gmail-gr_31 gmail-m_-5609900448298310016gmail-gr-alert gmail-m_-5609900448298310016gmail-gr_gramm gmail-m_-5609900448298310016gmail-gr_inline_cards gmail-m_-5609900448298310016gmail-gr_disable_anim_appear gmail-m_-5609900448298310016gmail-Punctuation gmail-m_-5609900448298310016gmail-only-ins gmail-m_-5609900448298310016gmail-replaceWithoutSep" id="gmail-m_-5609900448298310016gmail-31" style="display:inline;border-bottom:2px solid transparent;background-repeat:no-repeat;color:inherit;font-size:inherit">Basically</span></span> when we send <span class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_ gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_859 gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr-alert gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_gramm gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_inline_cards gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_run_anim gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-Grammar gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-only-ins gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-doubleReplace gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-replaceWithoutSep" id="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-859" style="display:inline;border-bottom:2px solid transparent;background-repeat:no-repeat;font-size:inherit">packets</span> from <span class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_ gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_860 gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr-alert gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_gramm gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_inline_cards gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-gr_run_anim gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-Grammar gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-only-ins gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-replaceWithoutSep" id="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-860" style="display:inline;border-bottom:2px solid transparent;background-repeat:no-repeat;font-size:inherit">US/Canada</span> to China, through traceroute and the RTT of each hop, we can locate the last hop in the US before the packets enter China (<b>there is a large jump of RTT of 100+ms from this hop onwards</b>). Oftentimes the ownership of such routers is ambiguous.</div><div dir="ltr"><br></div></span><div dir="ltr">These hops whose IPs seem to belong to US or European ISPs (<b>according to BGP info</b>) but their reverse DNS names have <i><span class="gmail-m_-5609900448298310016gmail-gr_ gmail-m_-5609900448298310016gmail-gr_25 gmail-m_-5609900448298310016gmail-gr-alert gmail-m_-5609900448298310016gmail-gr_spell gmail-m_-5609900448298310016gmail-gr_inline_cards gmail-m_-5609900448298310016gmail-gr_run_anim gmail-m_-5609900448298310016gmail-ContextualSpelling" id="gmail-m_-5609900448298310016gmail-25" style="display:inline;border-bottom:2px solid transparent;background-repeat:no-repeat;color:inherit;font-size:inherit"><span class="gmail-m_-5609900448298310016gmail-gr_ gmail-m_-5609900448298310016gmail-gr_26 gmail-m_-5609900448298310016gmail-gr-alert gmail-m_-5609900448298310016gmail-gr_spell gmail-m_-5609900448298310016gmail-gr_inline_cards gmail-m_-5609900448298310016gmail-gr_disable_anim_appear gmail-m_-5609900448298310016gmail-ContextualSpelling" id="gmail-m_-5609900448298310016gmail-26" style="display:inline;border-bottom:2px solid transparent;background-repeat:no-repeat;color:inherit;font-size:inherit">chinaunicom</span></span></i> in it, which is a Chinese ISP. </div></font></span><div class="gmail-m_-5609900448298310016gmail-adL"><span class="gmail-m_-5609900448298310016gmail-im"><font color="#000000"><div dir="ltr"><div class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-m_-5444955998713831722gmail-m_8029302695426111918gmail_signature"><div>AS1299 Telia Company AB</div></div><span class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-im"><div class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-m_-5444955998713831722gmail-m_8029302695426111918gmail_signature">62.115.170.57 name = <a href="http://chinaunicom-ic-341501-sjo-b21.c.telia.net/" target="_blank">chinaunicom-ic-341501-sjo-b21.c.telia.net</a>.</div></span><div class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-m_-5444955998713831722gmail-m_8029302695426111918gmail_signature">62.115.33.230 <span style="color:rgb(34,34,34)">name = </span><a href="http://chinaunicom-ic-302366-las-bb1.c.telia.net/" target="_blank">chinaunicom-ic-302366-las-bb1.c.telia.net</a><span style="color:rgb(34,34,34)">.</span> <br></div><div class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-m_-5444955998713831722gmail-m_8029302695426111918gmail_signature">213.248.73.190 name = <a href="http://chinaunicom-ic-127288-sjo-b21.c.telia.net/" target="_blank">chinaunicom-ic-127288-sjo-b21.c.telia.net</a>. <br></div><div class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-m_-5444955998713831722gmail-m_8029302695426111918gmail_signature"><br></div><div class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-m_-5444955998713831722gmail-m_8029302695426111918gmail_signature">AS701 <span style="white-space:pre-wrap">Verizon Business</span> <br></div><div class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail-m_-5444955998713831722gmail-m_8029302695426111918gmail_signature">152.179.103.254 name = <a href="http://chinaunicom-gw.customer.alter.net/" target="_blank">chinaunicom-gw.customer.alter.net</a>.</div></div><div dir="ltr"><br></div><div dir="ltr">While the following routers, they don't have a reverse DNS name at all, which seem to be uncommon if they were managed by US or European ISPs but quite common for Chinese ISPs.</div><div dir="ltr"><div dir="ltr" class="gmail-m_-5609900448298310016gmail-m_3975476226920052932gmail-m_8681639254013145971gmail-m_5589992378986080225m_-3183345251199778734gmail-m_2136248619369274442gmail-m_-4237133297524689392gmail_signature"><div>AS6453 TATA COMMUNICATIONS (AMERICA) INC <br></div><div>63.243.205.90</div><div>66.110.59.118 </div></div></div></font></span></div></div><div class="gmail-m_-5609900448298310016gmail-adL" style="color:rgb(34,34,34)"><span class="gmail-m_-5609900448298310016gmail-im"><font color="#000000"><div dir="ltr"><br></div><div>Can anyone confirm that these are indeed managed by the Chinese ISPs (even though they are physically located in the US according to the traceroute and RTT analysis)?</div></font></span></div><div style="color:rgb(34,34,34)"><br class="gmail-m_-5609900448298310016gmail-Apple-interchange-newline"></div></div></span></font></span></div><div><div dir="ltr" class="gmail-m_-5609900448298310016m_-622218943354037036gmail_signature"><br>Best,<br>Pengxiong Zhu<br>Department of Computer Science and Engineering<br>University of California, Riverside</div></div></div>
</blockquote></div>