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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: NAP/ISP Saturation WAS: Re: Exchanges that matter...
Craig Nordin <[email protected]> wrote: >> Er. There's no such thing as perfect transport as long as TCP is >> concerned. If end-hosts support large windows, even a single >> TCP session will load the network to the point where it'll lose >> packets. >What you say here makes sense to me. But, out of a 500 >ping sample over the course of half a day, I was getting well >below one percent loss -- six months ago. Most TCP sessins are pretty short, in fact. They simply have no chance to open window. Also, there's a lot of old TCP implementations which have window limited to 64Kb (or less!). >Now, my same sample group is going for more than three percent, >with many ten percent loss routes showing... Well, nobody argues that Internet is overloaded. But the question of how to measure the congestion is not as simple as just pinging. The problem is that there's no reasonable way to learn loss statistics from routers. --vadim - - - - - - - - - - - - - - - - -
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