Design Considerations for Usage Accounting and Feedback in Internetworks
نویسندگان
چکیده
comparison to at per packet charging. Investigate the interaction with existing and proposed TOS and network service disciplines (e.g., congestion control mechanisms). Investigate granularity, feedback rate, and feedback channel design trade-os and interactions. Fraud detection protocol Investigate alternatives for fraud detection protocols. Investigate use of existing communication channels between end point and transit nodes (e.g., congestion control signals, policy routing related communication [12]). Multicast Many applications are of a multicast nature, e.g., teleconferencing and information distribution lists. To the extent explicit multicast support leads to more ecient delivery of multi-destination messages , the introduction of usage accounting and feedback could motivate additional multicast support and use. However, one characteristic of mul-ticast is that the sender rarely knows how many destinations will receive the message, nor where those destinations are located, nor the intermediate path. Consequently, users might face unknown charges when sending multicast trac if packets are accounted for on a per-packet basis. Because multicast implementation is a globally more e-cient approach than multiple, directed unicasts, it would be very unfortunate if its use was discouraged because users did not know what to expect. Much work is needed to investigate alternative accounting and feedback mechanisms in the light of multicast. 14 6 Acknowledgments We are very grateful to
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