Provided by: Ericsson Research
Date Added: Mar 2012
The AS path prepending approach in BGP is commonly used to perform inter-domain traffic engineering, such as inbound traffic load-balancing for multi-homed ASes. It artificially increases the length of the AS level path in BGP announcements by inserting its local AS number multiple times into outgoing announcements. In this paper, the authors study how the AS path prepending mechanism can be exploited to launch a BGP prefix interception attack. Their paper is motivated by a recent routing anomaly related to AS path prepending behavior, i.e., Facebook's traffic being redirected to Korea and China due to a shorter path with fewer prepending ASNs.