NANOG Meeting Presentation Abstract

The Impact of BGP Misconfiguration on Connectivity
Meeting:	NANOG23
Date / Time:	2001-10-23 2:15pm - 2:45pm
Room:	OCC East
Presenters:	Speakers: Ratul Mahajan, University of Washington. David Wetherall, University of Washington. Tom Anderson, University of Washington.
Abstract:	While it is well-known that BGP is vulnerable to simple, accidental misconfigurations that can cause widespread loss of connectivity, most of the evidence is anecdotal. Routing configuration errors have received less attention than more popular threats to connectivity, such as denial-of-service, and CAIDA\'s BGP analyses and Merit\'s IPMA project provide some of the only data available. We present initial results of a new study of BGP configuration errors based on publicly available routing table snapshots and looking glasses. We quantify the kind and extent of configuration errors, as well as their impact on backbone connectivity. In this talk, we focus on announcements with incorrect origin AS and partial connectivity. We find that there are a significant number of questionable routing announcements, but the majority of these have only a slight impact on connectivity. Of the roughly 2% of the prefixes per day that are not announced with consistent origins, O(100) prefixes are subject to AS-path stripping and potential address space hijacks, while the other fluctuations are more benign. We also analyze partially connected address space (that is reachable only from some parts of the Internet) to expose route filtering and damping practices that are limiting connectivity. We find that 1-2% of the address space exists in a persistently partially reachable state at any given time.
Files:	The Impact of BGP Misconfiguration on Connectivity(PPT) The Impact of BGP Misconfiguration on Connectivity
Sponsors:	None.

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NANOG23 Abstracts

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• BGP Multiple Origin AS (MOAS) Conflicts
  Speakers:
  Xiaoliang ZhaoNCSU; .
  Dan MasseyUSC/ISI; .
  Allison MankinUSC/ISI; .
  S. Felix WuUC Davis; .
  Lan WangUCLA; .
  Dan PeiUCLA; .
  Lixia ZhangUCLA; .
  

• BGP Multiple Origin AS (MOAS) Conflicts
  Speakers:
  Xiaoliang ZhaoNCSU; .
  Dan MasseyUSC/ISI; .
  Allison MankinUSC/ISI; .
  S. Felix WuUC Davis; .
  Lan WangUCLA; .
  Dan PeiUCLA; .
  Lixia ZhangUCLA; .
  

• BGP Multiple Origin AS (MOAS) Conflicts
  Speakers:
  Xiaoliang ZhaoNCSU; .
  Dan MasseyUSC/ISI; .
  Allison MankinUSC/ISI; .
  S. Felix WuUC Davis; .
  Lan WangUCLA; .
  Dan PeiUCLA; .
  Lixia ZhangUCLA; .
  

• BGP Multiple Origin AS (MOAS) Conflicts
  Speakers:
  Xiaoliang ZhaoNCSU; .
  Dan MasseyUSC/ISI; .
  Allison MankinUSC/ISI; .
  S. Felix WuUC Davis; .
  Lan WangUCLA; .
  Dan PeiUCLA; .
  Lixia ZhangUCLA; .
  

• BGP Multiple Origin AS (MOAS) Conflicts
  Speakers:
  Xiaoliang ZhaoNCSU; .
  Dan MasseyUSC/ISI; .
  Allison MankinUSC/ISI; .
  S. Felix WuUC Davis; .
  Lan WangUCLA; .
  Dan PeiUCLA; .
  Lixia ZhangUCLA; .
  

• BGP Multiple Origin AS (MOAS) Conflicts
  Speakers:
  Xiaoliang ZhaoNCSU; .
  Dan MasseyUSC/ISI; .
  Allison MankinUSC/ISI; .
  S. Felix WuUC Davis; .
  Lan WangUCLA; .
  Dan PeiUCLA; .
  Lixia ZhangUCLA; .
  

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  Ratul MahajanUniversity of Washington; .
  David WetherallUniversity of Washington; .
  Tom AndersonUniversity of Washington; .
  

• The Impact of BGP Misconfiguration on Connectivity
  Speakers:
  Ratul MahajanUniversity of Washington; .
  David WetherallUniversity of Washington; .
  Tom AndersonUniversity of Washington; .
  

• The Impact of BGP Misconfiguration on Connectivity
  Speakers:
  Ratul MahajanUniversity of Washington; .
  David WetherallUniversity of Washington; .
  Tom AndersonUniversity of Washington; .
  

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