nanog mailing list archives
Re: NAP/ISP Saturation WAS: Re: Exchanges that matter...
From: alex () relcom EU net
Date: Wed, 18 Dec 96 12:45:45 +0300
As for me, congestion exists if long TCP sessions can't adapt their window sizes and packet drop if more than 3 - 5 % over connection line. This means more than 1,000 - 2,000 tcp sessions through 2 Mbit link, for example. Yes, IP is connectionless protocol, but Internet is not connectioonless network in real life...
Craig Nordin <cnordin () vni net> 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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Current thread:
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter..., (continued)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Brett L. Hawn (Dec 20)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Jon Zeeff (Dec 21)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Michael Dillon (Dec 20)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Curtis Villamizar (Dec 20)
- DoS Attacks Robert Laughlin (Dec 20)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Curtis Villamizar (Dec 20)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... dave o'leary (Dec 22)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Matt Ranney (Dec 17)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... alex (Dec 18)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Tony Li (Dec 19)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Nathan Stratton (Dec 19)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Avi Freedman (Dec 19)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Nathan Stratton (Dec 19)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Avi Freedman (Dec 20)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Nathan Stratton (Dec 20)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Alec H. Peterson (Dec 20)
- Re: NAP/ISP Saturation WAS: Re: Exchanges that matter... Tony Li (Dec 20)