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Date: Wed, 6 Nov 1996 17:07:27 -0600 (GMT-0600)
From: Victor Manuel Carranza Gonzalez <victor@usac.edu.gt>
To: freebsd-questions@freebsd.org
Subject: pppd:  What's a "bad fcs"???
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Hi there!

I'm having a lot of trouble with my ppp dialup router. It is really
driving me crazy!! Last time I wrote about this, someone told me about
upgrading to FreeBSD 2.1.5, 'cause 2.1.0 has bugs in the ppp daemon. Ok, I
have done it. the "Address already exists" message is gone, but now I have
OTHER problems :(

When I connect to the FreeBSD machine using Windows95 dialup networking,
everything works (apparently) fine, I can do a telnet session and spend an
hour working with no problem... but when I start Netscape or something
that puts a more heavy traffic on the line, pppd begins to send messages
to the console, as follows:

	ppp0: bad fcs
	/kernel: bad fcs

and the connection freezes. The modem does not hang, the FreeBSD box keeps
working normally, but no traffic occurs between the modems anymore. 

My checklist is as follows:

1. Modem cables: Ok

2. Modem setup: USRobotics Sportster 28.8, initialized at 38400bps using
   cu (getty uses 38400bps too).

3. pppd options file:
	modem
	passive
	domain xxxx.xxx.xx
	crtscts
	kdebug 1
	debug
	-mru
	-pc
	mru 1500
	proxyarp
	netmask 255.255.255.192

4. Kernel compiled with GATEWAY and ARP_PROXYALL options.

5. The serial port UART is a 16550A.

6. The modems are using error correction.


What could be happening here?  Give me some hints, PLEASE!!  this
situation is ruining my project of a unix dialup router, and I don't want
my department to spend lots of money on an access server, terminal server
or something like that instead.

Thanks in advance!

+-----------------------------------------------+
|      Victor Manuel Carranza Gonzalez          |
|  Unidad de Internet/Red Cientifico-Educativa  |
| Depto. de Procesamiento Electronico de Datos  |
| Universidad de San Carlos de Guatemala -USAC- |
|                                               |
|e-mail: victor@usac.edu.gt,                    |
|Telefono oficina: (502)4769723 (fax/voz)       |
|                  (502)4767719 (voz)           |
|Telefono casa   : (502)4782916 (502)2891037    |
+-----------------------------------------------+