Measuring BGP AS Path Looping (BAPL) and
Private AS Number Leaking (PANL)
Shenglin Zhang;Ying Liu;Dan Pei;Baojun Liu
【期刊名称】《清华大学学报（英文版）》 【年(卷),期】2018(023)001
【摘要】As a path vector protocol,Border Gateway Protocol (BGP) messages contain an entire Autonomous System (AS) path to each destination for breaking arbitrary long AS path loops.However,after observing the global routing data from RouteViews,we find that BGP AS Path Looping (BAPL) behavior does occur and in fact can lead to multi-AS forwarding loops in both IPv4 and IPv6.The number and ratio of BAPLs in IPv4 and IPv6 on a daily basis from August 1,2011 to August 31,2015 are analyzed.Moreover,the distribution of BAPLs among duration and loop length in IPv4 and IPv6 are also studied.Several possible explanations for BAPL are discussed in this paper.Private AS Number Leaking (PANL) has contributed to 0.20％ of BAPLs in IPv4,and at least 1.76％ of BAPLs in IPv4 were attributed to faulty configurations and malicious attacks.Valid explanations,including networks of multinational companies,preventing particular AS from accepting routes,also can lead to BAPLs.Motivated by the large number of PANLs that contribute to BAPLs,we also study the number and the ratio of PANLs per day in the 1492 days.The distribution of the private AS
Measuring BGP AS Path Looping (BAPL) and Private AS Number Leaking (PANL)
