Serial Ports and PPPD Problems

Support knowledgebase (hoe_pppd_sdevice_speed)
Applies to

SuSE Linux: All versions

Symptom:

You want to set up a connection to the Internet. After the successful dial-in, the PPP daemon (pppd) is started but it aborts after a few seconds. The file /var/log/messages contains status signals similar to

Dec 06 20:46:51 earth pppd[375]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xa20343a4> <pcomp> <accomp>]
This message is displayed several times and is followed by
Dec 06 20:47:21 earth pppd[375]: LCP: timeout sending Config-Requests

Cause:

There might be a problem with the port speed. The port speed is preset to 115200 baud, but this value may be too high in some cases.

Solution:

First set the port speed to a small value. This can be done e.g. for the first port, with
setserial /dev/ttyS0 baud_base 9600

Replace the port name above with your own. The first port is called (COM1) ttyS0, the second port (COM2) ttyS1, etc.
Please respect uppercase and lowercase (case sensitive).

Now increase the speed again by approaching the highest possible value step by step.

Insert the setserial command in the file /edit/init.d/boot.local so that it can be automatically executed when booting.


Keywords: MODEM, INTERNET, PPPD, WVDIAL, LCP, PORT, SERIAL

Categories: Network

SDB-hoe_pppd_sdevice_speed, Copyright SuSE Linux AG, Nürnberg, Germany - Version: 20. Jun 2002
SuSE Linux AG - Last generated: 21. Jun 2002 by ip (sdb_gen 1.40.0)