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The Internet consists of thousands of autonomous systems (ASs), each
advertising one or more prefixes it has connectivity to. According to RFC
1930, each prefix should originate from a single AS. However, more than one
ASs may advertise reachability to a given prefix, so called multiple origin
AS conflict (MOAS). To this end, this paper analyzes and quantifies MOAS
conflicts from a dataset consisting of routing updates collected over 21 days
in January, 2007, and presents ten scenarios that lead to MOAS conflicts.
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