Actually it does not only count on the users , it also counts on the equipment. You have spoken on giving internet access ... You will need to control each user to see how much traffic and at what speeds they are transmiting, also if one has a computer virus that floods the hole network ( imagening that you have no control for the bandwith on the user side ) all your other users will suffer from this... - So basically you may have a squid, but how are you going to control the rates from each user to your AP ?! - What about when the users start flooding spam to the internet and you start being acused of spam ? Good luck... Andrew M.A. Cater wrote: >On Tue, Nov 08, 2005 at 07:51:30PM -0000, Eduardo Gargiulo wrote: > > >>Nate Duehr <nate@natetech.com> said: >> >> >> >>>Eduardo Gargiulo wrote: >>> >>> >>>>network. I'm thinking to pay a data link to feed a debian box and from there, >>>>via wireless links (802.11b), give internet access to aprox. 15 users. I want >>>>to guarantee 128 kb/s for every node. Which is the best way to calculate this? >>>> >>>> >>>> >First: as others have said: it depends on what you're doing and on what >your users are doing. > >Take the easiest case: you need to provide (effectively) 128k to each >user continuously, guaranteed. The equivalent of an ISDN2 line each, all >the time. > >16 x 128 = 2MB > >This is the sort of thing that routers and Quality of Service and >forced bandwidth quotas and load balancing were invented for :) > >In reality, the usage pattern per PC is much more asynmetrical: it's >probably 10:1 in terms of actual time on the net - most people spend far >more time reading their email / reading web pages than it actually takes >to download the page - effectively, their computer is virtually idle - >and is probably also more than 10:1 in favour of downlink (pulling >traffic down) rather than uplink (ping responses/DNS/ftp/web requests ...) >[My ISP provides 10M down but only 512k up on cable, for example] > >Hard disk is cheaper than bandwidth: use a squid proxy to cache common >requests: build up mirrors of popular download sites if you can. > >Andy > > >>>You've already got it in your original message. >>> >>>15 * 128KB seems to be a relatively simple calculation. Plus overhead >>>if the server is actually doing server duty like e-mail or web. >>> >>>Not sure what the question is here. >>> >>> >>I think there was a missunderstanding of my problem (probably because of my >>poor english). >> >>I don't think that the relationship between bandwidth and simultaneous users >>using that bandwidth is linear (FIXME). The problem is one internet connection >> to a linux box, and 15 wireless users (simultaneously connected in the worse >>case) with 128Kbps guaranteed. The question: How much bandwidth should I >>purchase to satisfy that requirement? You mean 15 * 128Kbps = ~2Mbps ??? I >>think it's too much for 15 users!! >> >>regards, >> >>--ejg >> >> >> >>-- >>To UNSUBSCRIBE, email to debian-isp-REQUEST@lists.debian.org >>with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org >> >> > > > >
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