Re: [2.2.{12,13p15}] PPP uploads fizzle out and die (tcpdump info incl.)

[Paul Mackerras]

On Thu, 07 Oct 1999, Steve Dodd wrote:

> Anyway, I hacked pppdump to output in a format that pcap/tcpdump could
> understand (after learning quickly about all the weird byte-saving compression
> options -- eww), and the packets seem to be reaching the tty alright. If
> *my* serial port/modem was overrunning, something would log a message, wouldn't
> it? Can modems overrun when sending?

Yes, you can easily overrun the modem's transmit-side buffer, if you aren't
using some form of flow control.  If you are using crtscts flow control
(and you have told the modem to use this, usually at&k3), then the modem
should drop CTS when its transmit buffer is nearly full, and the serial
driver should notice this and stop sending characters until the modem
raises CTS again.

Paul.

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