look for BGP routes containing local AS#
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Song Li
refresh.lsong at gmail.com
Tue Jan 27 15:24:14 CET 2015
not necessary, it can appear in any place in the received AS-PATH. regards Song 在 2015/1/27 22:20, Carlos M. Martinez 写道: > Is 'local as' the same as the origin-as ? That is, the first item in the > AS-PATH list ? > > regards > > Carlos > > On 1/27/15 12:16 PM, Song Li wrote: >> For example, My AS# is 23910 and the 'local AS' is 23910. If our BGP >> router received a route from the BGP neighbor AS1 with the AS-PATH: 1 .* >> 23910, then the route is what we are looking for. >> >> 在 2015/1/27 22:05, Carlos M. Martinez 写道: >>> Can you clarify what do you mean by 'local AS' ? >>> >>> regards >>> >>> Carlos >>> >>> On 1/27/15 11:48 AM, Song Li wrote: >>>> Hi everyone, >>>> >>>> Recently I studied the BGP AS path looping problem, and found that in >>>> most cases, the received BGP routes containing local AS# are suspicious. >>>> However, we checked our BGP routing table (AS23910,CERNET2) on juniper >>>> router(show route hidden terse aspath-regex .*23910.* ), and have not >>>> found such routes in Adj-RIB-In. >>>> >>>> We believe that the received BGP routes containing local AS# are related >>>> to BGP security problem. Hence, we want to look for some real cases in >>>> the wild. Could anybody give us some examples of such routes? >>>> >>>> Thanks! >>>> >>>> Best Regards! >>>> >> >> -- Song Li Room 4-204, FIT Building, Network Security, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China Tel:( +86) 010-62446440 E-mail: refresh.lsong at gmail.com
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