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Re: TCP/IP question.

To: Statux <statux@xxxxxxxxxxx>
Subject: Re: TCP/IP question.
From: Ben Greear <greearb@xxxxxxxxxxxxxxx>
Date: Mon, 05 Mar 2001 22:50:09 -0700
Cc: jamal <hadi@xxxxxxxxxx>, Andrew Morton <andrewm@xxxxxxxxxx>, netdev@xxxxxxxxxxx
Organization: Candela Technologies
References: <Pine.LNX.4.30.0103060009090.14995-100000@circuit.moureaux.com>
Sender: owner-netdev@xxxxxxxxxxx
Statux wrote:
> 
> > Once a TCP/IP connection has been established (say via accept and connect),
> > the resulting connection is symetric right?
> 
> Not always. There is a lot of asymmetric hardware out there... namely 56K
> modems and ADSL, etc.
> 
> 56K modems, for instance, upload at about 33.6K and download at 53K
> (based on FCC regulations in the USA, that 53K number might be different
> in other countries).
> 
> I think that I'm right with that answer :) Anyone else?

Well, my hardware is symmetric, and I've tried moving the accept'er from
one side to the other..and the slow transmit side follows the guy that's
accepting.

On a similar topic:  I am sending large bunches of TCP/IP traffic,
say 24kbytes at a time.  However, on the receive, I never read more
than 14k or so, even though the specified max to read is 40kB or so.
(It's non-blocking reads...)  Is that 14k a tunable paramter?

UDP traffic doesn't suffer from that problem of course, because you
receive the entire PDU at once.....

-- 
Ben Greear (greearb@xxxxxxxxxxxxxxx)  http://www.candelatech.com
Author of ScryMUD:  scry.wanfear.com 4444        (Released under GPL)
http://scry.wanfear.com               http://scry.wanfear.com/~greear

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