This question has relevance to the ASPA method for route leak detection. Is it possible that an ISP AS A peers with a customer AS C via a non-transparent IXP AS B? IOW, the AS path in routes propagated by the ISP A for customer C's prefixes looks like this: A B C. I.e., can the AS of a non-transparent IXP/RS appear in an AS path in the middle between an ISP and its customer?
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