On Tue, 15 Jun 2004 03:17:06 +1200
"JonoCo" <jonoco@i4free.co.nz> wrote:

>
>
> Basically why I covered my comments with "Please excuse my 'not so sureness'
> of the situation". Also I figured a linux router would be pretty intelligent
> as to whether something was txt or a picture, guess not.
>
> Cheers for your feedback.
>

sorry if it sounded blunt ;-)
good luck with the project

> Jono
>
> -----Original Message-----
> From: owner-adsl@unixathome.org [mailto:owner-adsl@unixathome.org] On Behalf
> Of Nick Rout
> Sent: Monday, 14 June 2004 8:35 a.m.
> To: adsl@lists.unixathome.org
> Subject: Re: Combining two ADSL lines
>
> On Sat, 2004-06-12 at 16:09, JonoCo wrote:
> > If we were to get two ADSL lines into the house, what's the best way, if
> at
> > all, to organise some sort of QoS system so that small packets where to
> run
> > through one router, and big ones through another. Please excuse my "not so
> > sureness" of the situation, but how I see it is that a file
> download/picture
> > etc would have a larger packet size? Where as text (like from a
> > website)/game packets would have a smaller size? I'm thinking along the
> > lines of a Linux router box with two routers coming off that?
> >
> > Ideally, if you request data from a website any small stuff such as text
> > comes through one connection, and pictures come through the other
> > connection. Is this doable? Can imagine greatly speeding up web surfing
> and
> > game play, while downloading at the same time. Problem is that I'm
> flatting
> > with 7 other computer savvy people, so the one connection doesn't get
> > utilised too well.
> >
> > Any suggestions would be appreciated.
> >
> > Jono
>
>
> You are working on a completely false assumption. In general the maximum
> packet size is determined by the MTU which is usually about 1500.
>
> Therefore any payload over 1500 bytes is going to be mainly made up of
> the largest possible packets.
>
> For example and "average" size list email of, say, 5000 bytes is going
> to be made up of 3 packets of 1500 and one of 500. A large email with a
> big attachment will be almost entirely packets of the largest possible
> size.
>
> A web page will be made up of a chunk of html text, as well as picture
> files, but probably each element will mainly be made up of a file over
> 1500 bytes.
>
> Also take the download of a web page with text and pictures, all the
> requests go out on port 80 - how does the router know whether the
> request is for a picture or text?
>
> What is far more feasible is to route depending on port number, ie web
> and ftp requests go out to connection A and everything else to
> connection B. (As JP Wise has suggested)
>
> [There are some gross over generalisations in what i have written.]
>
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>
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