Hi: During the Hiroshima IETF, there was some discussion on how to use the provisioned bandwidth for ALTO [1].
I suspect that one reason why there hasn't been a more in-depth list discussion on this topic after Hiroshima may be the lack of public availability of specific characteristics of residential networks. Some aspects we touched upon in the Hiroshima discussion included the frequency by which the IP address changes to make it long-term reliable host identifier, etc. At about the same time we were meeting in Hiroshima, the ACM IMC conference was taking place in Chicago. One of the papers there is entitled "On dominant characteristics of residential broadband Internet traffic" by Maier et al. [2]. The data is based on 20,000 residential DSL lines belonging to a major European ISP (we probably should stay away from drawing a general conclusion for other access methods like cable and fiber.) Regardless, the paper makes for some interesting reading and provides some insight into DSL residential broadband. The findings in here are interesting and we can use some of these for our work in ALTO. To summarize some of the work: 1) Less than a quarter of active lines exceed 50% of their bandwidth for even one second over a 5m period. During the day, 50-60% of the active lines achieve at least a 10% band- width utilization. 2) Session durations are surprisingly short -- a median duration of only 20-30m. 3) IP addresses are re-assigned frequently, with up to 4% of addresses assigned more than 10 times a day, and 50% are reassigned at least twice in 24h (in other words, the use of IP addresses as host identifiers can be misleading over fairly short time scales.) 4) HTTP dominates (> 50% of traffic) in terms of bytes due to streaming of Youtube videos, etc. 5) Examining TCP round-trip times, for many TCP connections the access bandwidth-delay product exceeded the advertised windows, making it impossible for the connection to saturate the access link. [1] Item 3 in http://trac.tools.ietf.org/wg/alto/trac/wiki/Ietf76 [2] G. Maier, A. Feldmann, V. Paxon, and M. Allman, "On dominant characteristics of residential broadband Internet traffic," Proceedings of the 9th ACM SIGCOMM conference on Internet measurement conference (IMC), pp. 90-102, November 2009. Thanks, - vijay -- Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent 1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA) Email: v...@{alcatel-lucent.com,bell-labs.com,acm.org} Web: http://ect.bell-labs.com/who/vkg/ _______________________________________________ alto mailing list [email protected] https://www.ietf.org/mailman/listinfo/alto
