> a) make sure the TAs create and obey cts/rts
>
> b) make sure your machine's serial ports are used with crt/rts (your
>    variant of ppp will have to be configured for this; for "normal" pppd
>    it's the "crtscts" keyword, I think)

The TA's were configured to use cts/rts flow control and I'd also configured
pppd to use cts/rts. Is the fact the the TA's are USB likely to be a problem
in this regard? Surely the USB flow control works in exactly the same way as
serial?

> 1. serial handshaking problem, resulting in bytes lost resulting in ppp
>    packet  loss

Is there any test that I can perform to explicitly confirm that serial
handshaking is the problem?

Thanks,
 Brad

----- Original Message ----- 
From: "Brad du Plessis" <bradd@cat.co.za>
To: "Brad DuPlessis" <bradd@cat.co.za>
Sent: Wednesday, December 08, 2004 4:48 PM
Subject: Re: ftp over ppp problem


> ----- Original Message ----- 
> From: "Ignatios Souvatzis" <ignatios@cs.uni-bonn.de>
> To: <tech-net@NetBSD.org>
> Sent: Wednesday, December 08, 2004 2:44 PM
> Subject: Re: ftp over ppp problem
>
> On Wed, Dec 08, 2004 at 02:44:07PM +0200, Brad du Plessis wrote:
> >
> > The issue I'm seeing is that while a telnet session between the two
seems
> to
> > work fine, an ftp session does not. After initiating the ftp connection,
> > doing a directory listing on the remote system (ls) works ok most of the
> > time. However, attempting to transfer a file in either direction appears
> to
> > transmit no data whatsoever.
> >
> > What's more interesting, is that when I set the transmit and receive
> buffer
> > size for the ftp session to 512 bytes, I can transfer data without a
> problem
> > (albeit very slowly, about 2KBytes / second).
>
> In my humble experience, the three most likely causes of this are:
>
> 1. serial handshaking problem, resulting in bytes lost resulting in ppp
>    packet  loss
> 2. serial handshaking problem, resulting in bytes lost resulting in ppp
>    packet  loss
> 3. serial handshaking problem, resulting in bytes lost resulting in ppp
>    packet  loss.
>
> a) make sure the TAs create and obey cts/rts
>
> b) make sure your machine's serial ports are used with crt/rts (your
>    variant of ppp will have to be configured for this; for "normal" pppd
>    it's the "crtscts" keyword, I think)
>
> c) make sure your serial cable has at least 8 connected lines:
>    2,3,4,5,6,7,8,20
>
>  -is
>
>
>