Re: Dialup problem solved

[Ross <nospam [at] virgin.net>]

the utility assumes that people want high download rates for large file
transfers so the settings are biased towards this. The main function of the
utility is to provide all the required settings such as RWIN / MSS / MaxMTU
/ PMTUautodiscovery / etc....... which are not all user definable as
default.

the optimum values are preset and have been determined for standard PC users
using standard modems. it does however, allow you to select automatic
detection/optimum or basic settings as well as a bit of an explanation of
what packet switching is all about. it also provides a user friendly
interface for testing your own MTU values so eventually finding the
'Optimum' values for your setup and internet connection at that time.

Ross
----- Original Message -----
From: Jim Jackson <jj [at] scs.leeds.ac.uk>
To: Ross <ros.h [at] virgin.net>
Cc: Barrie Bremner <TheEnglishman@ecosse.net>; <sheflug [at] listbot.com>
Sent: Monday, December 13, 1999 11:49 AM
Subject: Re: Dialup problem solved (touch wood!)

> sheflug - http://www.sheflug.co.uk
>
> I am intrigued that an optimum can be so calculated. In effect what you
> are getting is some guys intelligent guess. The optimum MTU will depend
> on your use of the link (single heavy file transfers or multiple
> concurrent interactive type jobs or something in between) and the link
> quality. Any idea about the assumptions inherent in the MTU speed guess
> work? Just curious.
>
> Jim
>
> On Mon, 13 Dec 1999, Ross wrote:
>
> > the optimum MTU values can vary with every hardware configuration. If
you
> > run windows, try using 'MTU speed'(http://www.mjs.u-net.com/), it will
give
> > you the optimum value for MTU for your setup which you can then transfer
to
> > 'LINUX'
> >
> > Sorry, but i'm too new to 'Linux' to recommend any software that does
the
> > same under 'LINUX'
> >
> > Ross
> > ----- Original Message -----
> > From: Jim Jackson <jj [at] scs.leeds.ac.uk>
> > To: Barrie Bremner <TheEnglishman [at] ecosse.net>
> > Cc: <sheflug [at] listbot.com>
> > Sent: Monday, December 13, 1999 8:04 AM
> > Subject: Re: Dialup problem solved (touch wood!)
> >
> > > sheflug - http://www.sheflug.co.uk
> > >
> > > You might be better lowering the mtu and mru values to 552. It means
when
> > > an error does there is less to re-transmit. You arelikely to get some
> > > error level, mainly because of the conservative way that Linux handles
> > > IDE disks. It disables interrupts during much of the handling of IDE
disk
> > > requests, which can take enough time for even an UART with a 16
element
> > > fifo to overrun and loose characters. You may have the hdparm utility
> > > installed - try running with
> > >
> > > hdparm -u 1
> > >
> > > but check the manual page for hdparm first - there are warnings about
some
> > > older (E)IDE hardware not coping with this. If it works then put this
is
> > > somewhere appropriate so it gets run at reboot.
> > >
> > > Jim
> > >
> > > On Sun, 12 Dec 1999, Barrie Bremner wrote:
> > >
> > > > sheflug - http://www.sheflug.co.uk
> > > >
> > > > OK, well, thanks to Alex for all the help..
> > > >
> > > > It looks like my problem was with /etc/ppp/options.
> > > >
> > > > As it stands, the file contained only one line:
> > > >
> > > > lock
> > > >
> > > > However, it`s a bit better like this:
> > > >
> > > > lock
> > > > modem
> > > > -crtscts
> > > > mtu 1500
> > > > mru 1500
> > > >
> > > > Hardware error correction appears to have been the main
> > problem...errors are
> > > > down from >50% to <9%. Yippee!
> > > >
> > > > Hope this helps folk.
> > > >
> > > > BTW, this is still using my nice **FREE** ISP!! Cheers! :-)
> > > >
> > > > Baz.
> > > >
> > > > -----------------------------------
> > > >
> > > > Barrie J Bremner.
> > > >
> > > > Email: TheEnglishman [at] ecosse.net
> > > >
> > > > Website: http://www.geocities.com/thefatenglishman/
> > > >
> > > > Phone: UK 0131 313 3266
> > > >
> > > > Fashion is a form of ugliness so intolerable that we have to alter
it
> > > > every six months.
> > > >
> > > > - Oscar Wilde
> > > >
______________________________________________________________________
> > > > To unsubscribe, write to sheflug-unsubscribe [at] listbot.com
> > > >
______________________________________________________________________
> > > > Enter to win the Kenmore Elite dream kitchen sweepstakes only at
> > sears.com! Win a new refrigerator, stove, dishwasher and $10,000 for
> > remodeling. Hurry, sweepstakes ends December 30, 1999. Click to enter
> > http://www.listbot.com/links/sears4. See site for official rules.
> > > >
> > >
> > > ______________________________________________________________________
> > > To unsubscribe, write to sheflug-unsubscribe [at] listbot.com
> > > ______________________________________________________________________
> > > Enter to win the Kenmore Elite dream kitchen sweepstakes only at
> > sears.com! Win a new refrigerator, stove, dishwasher and $10,000 for
> > remodeling. Hurry, sweepstakes ends December 30, 1999. Click to enter
> > http://www.listbot.com/links/sears4. See site for official rules.
> >
>
> ______________________________________________________________________
> To unsubscribe, write to sheflug-unsubscribe [at] listbot.com
> Start Your Own FREE Email List at http://www.listbot.com/links/joinlb

Start your own FREE mailing list at

&copy; 2000 Microsoft Corporation. All Rights Reserved