From e06cea3697e080baff8104aa0fc2ab884e8c0b5c Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Wed, 21 Jul 1999 00:24:52 +0000 Subject: [PATCH] talk about using init option for dialin --- FAQ | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/FAQ b/FAQ index 780ca63..96bc5c7 100644 --- a/FAQ +++ b/FAQ @@ -607,3 +607,28 @@ if just with PAP using their login password (using the `login' option to pppd). If you do use `noauth', you should at least have a pppusers group and set the permissions on pppd to allow only user and group to execute it. + +------------------------------------------------------------------------ + +Q: When running pppd as a dial-in server, I often get the message +"LCP: timeout sending Config-Requests" from pppd. It seems to be +random, but dial-out always works fine. What is wrong? + +A: Most modern modems auto-detects the speed of the serial line +between the modem and the computer. This auto-detection occurs when +the computer sends characters to the modem, when the modem is in +command mode. It does not occur when the modem is in data mode. +Thus, if you send commands to the modem at 2400 bps, and then change +the serial port speed to 115200 bps, the modem will not detect this +change until something is transmitted from the computer to the modem. +When running pppd in dial-in mode (i.e. without a connect script), +pppd sets the speed of the serial port, but does not transmit +anything. If the modem was already running at the specified speed, +everything is fine, but if not, you will just receive garbage from the +modem. To cure this, use an init script such as the following: + + pppd ttyS0 115200 modem crtscts init "chat '' AT OK" + +To reset the modem and enable auto-answer, use: + + pppd ttyS0 115200 modem crtscts init "chat '' ATZ OK ATS0=1 OK" -- 2.39.2