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http://www.ee.surrey.ac.uk/Personal/L.Wood/publications/#protocol-radius TCP's protocol radius: the distance where timers prevent communication Lloyd Wood, Cathryn Peoples, Gerard Parr, Bryan Scotney, Adrian Moore. Peer-reviewed conference paper, to appear at the International Workshop on Space and Satellite Communications (IWSSC '07), Salzburg, Austria, September 2007. We examine how the design of the Transmission Control Protocol (TCP) implicitly presumes a limited range of path delays and distances between communicating endpoints. As well as showing the limits to TCP's communication range, we also show that ns's SYN/ACK exchange is not realistic compared to implementations, as it repeats sending SYNs infinitely. This seems to have encouraged people tweaking TCP for long distances in the past -- they don't realise that the SYN/ACK exchange limit in all implementations sets a hard limit on distance. cheers, L. <http://www.ee.surrey.ac.uk/Personal/L.Wood/><[EMAIL PROTECTED]>
