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border-collapse: collapse;"> <tr> <td width="25%" class="dot_line_right" align="left" valign="top" bgcolor="f4f8f4"> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://ipv6backbone.blogspot.com/" target="_blank" class="gray_link"><img src="/web/20150317233826im_/http://ipv6.nlsde.buaa.edu.cn/images/blogspot.jpg" title="our blog" border="0"/>Our Blog</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.buaa.edu.cn/" target="_blank">BeiHang University</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.nlsde.buaa.edu.cn/" target="_blank">SKLSDE HomePage</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.caida.org/" target="_blank">CAIDA</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.netdimes.org/" target="_blank">DIMES Project</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://irl.cs.ucla.edu/" target="_blank">UCLA Internet Lab</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://automation.sjtu.edu.cn:81/cnc/" target="_blank">SJTU CNC Lab</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.ipv6.org/" target="_black">IPv6:The Next Generation Internet</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.naist.jp/" target="_blank">Nara Institute of Science</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.personal.psu.edu/dvm105/blogs/ipv6/" target="_blank">Living with IPv6</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.librosnetworking.blogspot.com/" target="_blank">Mis Libros de Networking</a></li> <br/> <li class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.tunnelbroker.net/" target="_blank">IPv6 Tunnel Broker</a></li> <br/> <embed src="/web/20150317233826oe_/http://ipv6.nlsde.buaa.edu.cn/images/clock.swf" width="150" height="150" wmode="transparent" type="application/x-shockwave-flash"> </embed> <br/>  <div class="blogtitle">IPv4 Exhaustion</div><div align="left"> <script type="text/javascript" src="https://web.archive.org/web/20150317233826js_/http://ipv6.he.net/v4ex/sidebar.js"></script></div> <br/> </td> <td valign="top"> <div class="blogtitle">  IPv6 Backbone Network Topology (A Map of Ipv6 Internet)   </div> <br/> <div class="blogtext">  <table> <tr> <td valign="top"> <div id="textI">The IPv6 Group is a part of the State Key Laboratory of Software Development Environment(<span class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.nlsde.buaa.edu.cn/" target="_blank">SKLSDE</a></span>) in <span class="gray_link"><a href="https://web.archive.org/web/20150317233826/http://www.buaa.edu.cn/" target="_blank">BUAA</a></span>, China.We took up with research on IPv6 backbone network topology discovery,modeling and analysis.</p><p>Dolphin is our IPv6 backbone network topology discovery system, based on asynchronous traceroute probe.With the help of Dolphin,we are able to obtain some topological information of the IPv6 backbone network. <p>Until <strong><font color="red">2010.10.08 12:00</font></strong>,we have found <strong>1214</strong> ASes.</p>  <p align="center"> <table class="dot_line_cycle" width="60%" style="display:none"> <tr><td><img src="/web/20150317233826im_/http://ipv6.nlsde.buaa.edu.cn/images/u3.jpg"/></td><td colspan="8"><strong>During the last three monthes...</strong></td></tr> <tr>  <td><strong><font color="red">AS:</font></strong><td> <td><img src="/web/20150317233826im_/http://ipv6.nlsde.buaa.edu.cn/images/up.gif" border="0"/></td> <td><strong><font color="blue">29</font></strong></td>  <td><strong><font color="red">Interface:</font></strong><td> <td><img src="/web/20150317233826im_/http://ipv6.nlsde.buaa.edu.cn/images/up.gif" border="0"/></td> <td><strong><font color="blue">1890</font></strong></td> <td><strong><font color="red">Link:</font></strong><td> <td><img src="/web/20150317233826im_/http://ipv6.nlsde.buaa.edu.cn/images/up.gif" border="0"/></td> <td><strong><font color="blue">15430</font></strong></td> </tr> </table> </p> <p>Kinds of visualization tools we developed faciliates the display of topological infomation and analytical findings. Based on the data collected, we also established IPv6 internet network model to interpret the new metrics of IPv6 internet network topology.And at the same time,we presented some new algorithms in complex network analysis. </p> <p>Our future work includes measurements on the links,analysis of complex network robustness.</p> <p>The following pictures displays our recent IPv6 backbone topology discovery and display results.</p> </div> <div id="photo" align="center"> <table width="100%" align="center"> <tr class="dot_line_bottom"> <td width="50%" align="center" valign="top"> <table> <tr> <td><a href="images/as.jpg" title="click to see the primitive large pic" target="_blank"><img src="/web/20150317233826im_/http://ipv6.nlsde.buaa.edu.cn/images/as_small.jpg" class="image_background" alt="as topo"/></a></td> </tr> <tr> <td class="gray_link"><a href="images/as.jpg" title="click to see the primitive large pic" target="_blank">AS level IPv6 backbone network topology</a></td> </tr> </table> </td> <td width="50%"> <table> <tr> <td><a href="images/as2.jpg" title="click to see the primitive large pic" target="_blank"> <img src="/web/20150317233826im_/http://ipv6.nlsde.buaa.edu.cn/images/as2_small.jpg" class="image_background" alt="as topo"/> </a> </td> </tr> <tr> <td class="gray_link"><a href="images/as2.jpg" title="click to see the primitive large pic" target="_blank">AS level IPv6 backbone network topology</a></td> </tr> </table> </td> </tr> </table> </div> <span><a href="morepictures.html">More pictures ...</a><br/></span><br/> </td> </tr> </table> <table width="100%"> <tr> <td align="left" class="blogtitle">Selected Publications</td> </tr><tr><td><br/> <li>Jichang Zhao, Junjie Wu and Ke Xu. <a href="https://web.archive.org/web/20150317233826/http://ipv6.nlsde.buaa.edu.cn/paper/PRE2010.pdf">Weak ties: Subtle role of information diffusion in online social networks. Phys. Rev. E <strong>82</strong>, 016105 (2010).</a></li></td></tr> <tr><td><br/> <li>Zhongliang Qiao, Mingming Chen, Ke Xu. <a href="paper/ICCCN2010.pdf">Taking Too Many Destinations Can Be Bad for Traceroute Sampling</a>, ICCCN 2010, Zurich, Swizerland, August 2010<br/></li> </td></tr> <tr><td><br/> <li>Xin Zou, Zhongliang Qiao, Gang Zhou, Ke Xu. <a href="paper/GLO09.pdf">A logic distance-based method for deploying probing sources in the topology discovery</a>. IEEE GLOBECOM 2009.<br/></li> </td></tr> <tr><td><br/> <li>Jichang Zhao, Ke Xu. <a href="paper/JPA09.pdf">Enhancing the robustness of scale-free networks</a>. J. Phys. A: Math. Theor. 42 (2009) 195003. <br/></li> </td></tr> <tr><td><br/> <li>Bo Xiao, Liandong Liu, Xiaochen Guo, Ke Xu. <a href="paper/PHYSA09.pdf">Modeling the IPv6 Internet AS-level Topology</a>. Physica A 388(2009):529-540 <br/></li> </td></tr> <tr> <td><br/><span><a href="publish.htm">More papers ...</a></span></td></tr> </table>  </div> <br/> <hr noshade size="1" id="hrModuleContentSeparator"/> </td> </tr> </table> </div> </div> </div> </div> <div style="width:100%"> <table cellpadding="6" cellspacing="0" border="0" width="100%" class="page" align="center"> <tr> <td class="tfoot" align="right" width="100%"> <div class="smallfont"> <strong><a href="contact.htm" rel="nofollow">Contact Us</a> - <a href="contact.htm"> </a>- <a href="publish.htm">Archive</a> - <a href="#top" onclick="self.scrollTo(0, 0); return false;">Top</a> </strong> </div> </td> </tr> </table> <br/> <div align="center"> <div class="smallfont" align="center"> <table align="center"> <tr><td align="center">Powered By IPV6 SKLSDE,BeiHang University</td></tr> <tr><td align="center">Copyright ©2007-2010, Ipv6 Team Of State Key Laboratory of Software Development Environment,BeiHang University</td></tr> <tr> <td align="center"><script src="https://web.archive.org/web/20150317233826js_/http://s18.cnzz.com/stat.php?id=760257&web_id=760257&show=pic" language="JavaScript" charset="gb2312"></script></td></tr> </table> </div> </div> </div>  <script type="text/javascript"> var gaJsHost = (("https:" == document.location.protocol) ? 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