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Date:      Wed, 15 Oct 1997 16:35:42 +0930
From:      Greg Lehey <grog@lemis.com>
To:        "Matthew D. Fuller" <fullermd@futuresouth.com>
Cc:        parrothd@midwest.net, freebsd-questions@FreeBSD.ORG
Subject:   Re: tty-level buffer overflows
Message-ID:  <19971015163542.17582@lemis.com>
In-Reply-To: <Pine.BSF.3.96.971015015805.27275J-100000@shell.futuresouth.com>; from Matthew D. Fuller on Wed, Oct 15, 1997 at 02:04:15AM -0500
References:  <19971015145606.47003@lemis.com> <Pine.BSF.3.96.971015015805.27275J-100000@shell.futuresouth.com>

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On Wed, Oct 15, 1997 at 02:04:15AM -0500, Matthew D. Fuller wrote:
> On Wed, 15 Oct 1997, Greg Lehey wrote:
>
>> On Wed, Oct 15, 1997 at 12:19:14AM -0500, Matthew D. Fuller wrote:
>>> If I set it to 28800, no problems.  If I set it to 14400, no
>>> problems.  I know it's not my system that's slow; Cyrix 6x86 166, 72
>>> megs RAM, the serial ports are both 16550.
>>
>> What happens if you set the port speed to 57600?  If that works, that
>> should be enough for you.  Otherwise you should check your cabling and
>> modem setup.  You should be using hardware handshake.  Check this
>> excerpt from "The Complete FreeBSD":
> <snip>
>>
>> If you look at this profile, you'll notice that the active profile includes the
>> parameter &K4.   This  means  ``use  XON/XOFF  flow  control''.   This  is  not
>> desirable: it's better to use RTS/CTS flow control.  To fix it,
>>
> OK; maybe I did use bad phrasing...
> Both serial ports REPORT 16550.  cuaa1 is an internal 28.8 modem.  I can't
> look at my modem's settings now, obviously, since I'm PPP'd into my ISP,
> but when I do this:
> PPP ON mortis> show modem
> device: /dev/cuaa1 speed:28800
> cs8, no parity, CTS/RTS on.
> (blah blah blah)
> doesn't that mean that it is enabled at all levels?

It doesn't mean that the modem has CTS/RTS enabled.  The only way to
find that out is to ask it.

Greg



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