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Challenge 6: Multi-Domain Transport protocols operate over the Internet that is divided into AS characterized by their heterogeneity Variety of conditions (see also Challenge 2) and their variations leads to correlation effects between policers (that regulate traffic against certain conformance criteria) ECN [RFC3168]: policer must sit at every potential point of congestion => limitations when applied inter-AS Same congestion feedback mechanism is required on the entire path for optimal control at end-systems TCP rate controller (TRC) but TRC depends on the TCP end-to-end model => diversity of TCP implementations is a general problem |