and the core communication work horse "pppd". Usually it will be found at
/usr/sbin/pppd with permissions shown on my Ubuntu system by:
$ ls -l /usr/sbin/pppd
-rwsr-xr-- 1 root dip 257720 2006-07-05 08:58 /usr/sbin/pppd
The s means "sticky" meaning only one person can use pppd at a time.
As installed, it requires Root/Adm permissions to use pppd, directly or
through front end dialer tools. This is a security precaution common to
all COMM channels. But if you want to enable a simple User to dialout,
as is basically OK for a single user PC, do:
$ su - root
# chmod a+x /usr/sbin/pppd
or for Ubuntu:
$ chmod a+x /usr/sbin/pppd
after which there will be seen:
$ ls -l /usr/sbin/pppd
-rwsr-xr-x 1 root dip 257720 2006-07-05 08:58 /usr/sbin/pppd
with the last x meaning any one can execute pppd, either directly or
much more commonly through a front end dialer such as wvdial of KPPP.
Configuration file for wvdial
-------------------------------
There is a very smart dialer utility "wvdial"
which can be used once basic modem setup is accomplished. A configuration file
is needed, which begins below with [Dialer defaults]. This file can be accessed
any where by:
$ wvdial --config Path_to/configuration_file
Most commonly the configuration file is saved as:
/etc/wvdial.conf
whereat it will serve all Users of the computer. If saved as:
/home/LoginName/.wvdial.rc
it will be found and used before /etc/wvdial.conf. Note that "." beginning
a file name means "do not show it", excess through usage of:
$ ls -a
Many local configuration files are thus "hidden" in your /home/LoginName/ folder
Some Linux installations have dialup tools like Kinternet, GnomePPP, and the
Redhat/Fedora Internet Connection Wizard which are front ends for wvdial and
will write /etc/wvdial.conf files. For this reason, it is advisable to test
your configuration file first, before copying it to /etc/wvdial.conf. Typically
a first test is run with:
$ wvdialconf wvtest
WvModem<*1>: Cannot get information for serial port.
ttySL0<*1>: ATQ0 V1 E1 -- OK
ttySL0<*1>: ATQ0 V1 E1 Z -- OK
ttySL0<*1>: ATQ0 V1 E1 S0=0 -- OK
ttySL0<*1>: ATQ0 V1 E1 S0=0 &C1 -- OK
ttySL0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 -- OK
ttySL0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
ttySL0<*1>: Modem Identifier: ATI -- SmartLink Soft Modem
ttySL0<*1>: Speed 4800: AT -- OK
ttySL0<*1>: Speed 9600: AT -- OK
ttySL0<*1>: Speed 19200: AT -- OK
ttySL0<*1>: Speed 38400: AT -- OK
ttySL0<*1>: Speed 57600: AT -- OK
ttySL0<*1>: Speed 115200: AT -- OK
ttySL0<*1>: Speed 230400: AT -- OK
ttySL0<*1>: Speed 460800: AT -- OK
ttySL0<*1>: Max speed is 460800; that should be safe.
ttySL0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
Found a modem on /dev/ttySL0.
Modem configuration written to wvtest.
ttySL0
------
will be included in a successful run, where in this case /dev/ttySL0
is the responding device port. The generated wvtest file is:
[Dialer Defaults]
Modem = /dev/ttySL0
Baud = 460800
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ISDN = 0
Modem Type = Analog Modem
; Phone =
; Username =
; Password =
which at a minimim must be edited to a form like:
[Dialer Defaults]
Modem = /dev/ttySL0
Baud = 115200
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ISDN = 0
Modem Type = Analog Modem
Phone = 3334445555
Username = Your_Login_Name
Password = Your_Password
Additional if your modem port is of the type /dev/pts/N , with N a number,
then there MUST be added a line:
Carrier Check = no
This requirement currently applies to dialups using the helper utility: slmodemd
together with slamr, slusb or ALSA modem drivers, OR the " " : martian_helper
used with the martian_drv for Lucent/Agere modems with DSP chipsets.
Then a test dialput can be done with:
$ wvdial --config wvtest
There are some Systems for which the wvdialcon test will stall at rfcomm ports.
This is a wvdialconf bug and can be bypassed by just using wvdial with a trial
wvtest, but you need to specify the port appropriate to your modem.
If the configuration file below, lines beginning with # are comments.
Removing a # will activate a line with wvdial instructions appropriate to
special circumstances.
[Dialer defaults]
# Lines begining with # are comments.
# wvdial will look for this file at /etc/wvdial.conf or /home/LoginName/.wvdial.rc
# Redhat/Fedora have an Internet Connection Wizard in the popup menus
# ICW will write a two part /etc/wvdial.conf supporting multiple modem usage.
Modem = /dev/ttySL0
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
# Lack of dialtone acquisition can be due to low line voltage,
# a common problem in Italy.
# Try inserting a "dial without waiting": X3
# Init2 = ATQ0 V1 E1 S0=0 X3 &C1 &D2 +FCLASS=0
# In case of connection instabilities, specify a lower frequency:
# Init2 = ATQ0 V1 E1 S0=0 X3 &C1 &D2 +MS=34
# a MS=90 option is sometimes necessary for Internet Providers with buggy V92 protocols:
# Init2 = ATQ0 V1 E1 S0=0 X3 &C1 &D2 +MS=90
ISDN = 0
Modem Type = Analog Modem
Phone = Dialout_phone_number
# if going through a switch board, a perhaps necessary pause can produced with a comma:
# Phone = 1,Dialout_phone_number
Username = LoginName
# if Internet Provider is MSN.net, use under Linux: MSN/LoginName
Password = YourPassWord
# the following lines is NEEDED only for usage with slmodemd or martian_helper
Carrier check = no
# Kinternet appears to add it automatically.
## If CONNECT is achieved but browsing fails, try activating the following line
# Auto DNS = yes
## To make a logfile wvdial.out
# wvdial 2>&1 | tee wvdial.out
# # For some Internet providers, the following line is necessary
# Stupid Mode = yes
## for other wvdial options, do "man wvdial" or see the documentation in
## /usr/share/doc/wvdial/
# to dial an alternate provide use "wvdial 2nd" which will preferentially read:
[Dialer 2nd]
Phone = 2nd_phone_number
Username = 2nd_LoginName
Password = 2nd_PassWord
## End wvdial config file
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