Hi Michael and Gorry, I am following the ECN progress at IETF, and heard your presentation for draft-welzl-ecn-benefits in London. I am highly interested in this topic. As you might know that 3GPP had long completed ECN specification for audio/video service on the base station for congestion notification over the wireless link, but there is few experience in real practice. I am therefore interested in your draft and would like to see how it may help us with cellular scenario.
In particular, I believe the following questions regarding complications on ECN enabling from the network side are also relevant to this draft. 1, There are various middle-boxes along the end-to-end path where ECN signal is supposed to be communicated but actually partitioned at the middle-boxes. What are your recommendations regarding these boxes would also be part of the conclusion. For instance, TCP/HTTP/RTP proxy. 2, Tunnels, where end-to-end congestion status is separated in different headers and need to be combined or dropped at the tunnel exit. For example, GRE/IPSec tunneling. 3, Deployment considerations, it is somehow related to the first two, do we have to assume a unified deployment of consistent end-to-end ECN behavior in order to achieve the optimal gain? If so, the above issues need to be addressed. Otherwise, how can one choose between end-to-end and hop-by hop? Looking forward to your reply and thanks in advance. Regards, Lingli
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