linux下通过gprs模块拨号上网(转)

这几天做了一下gprs拨号上网，模块是西门子的mc39i。我的系统是fedora core 6。其实很简单，我又有高手指导，:-)。首先从/usr/share/doc/ppp-2.4.4/scripts中cp ppp-on,ppp-off,ppp-on-dialer三个脚本到/home/a/ppp。然后做如下修改: 在ppp-on里

1.改电话号码为*99***1#

2.将账号与密码清除

3.修改DIALER_SCRIPT的路径为/home/a/ppp/ppp-on-dialer

4.把下设备改成/dev/ttyS0,速率改为115200 5.将crtscts参数去掉,

在ppp-on-dialer里把帐号密码那块去掉。下面是对脚本的一些说明。当然都是网上搜来的了。:-) /home/a/ppp/ppp-on #!/bin/sh

# Script to initiate a ppp connection. This is the first part of the

# pair of scripts. This is not a secure pair of scripts as the codes

# are visible with the 'ps' command. However, it is simple.

# These are the parameters. Change as needed.

TELEPHONE=*99***1## The telephone number for the connection

ACCOUNT=# The account name for logon (as in 'George Burns')

PASSWORD=# The password for this account (and 'Gracie Allen')

LOCAL_IP=0.0.0.0# Local IP address if known. Dynamic = 0.0.0.0

REMOTE_IP=0.0.0.0# Remote IP address if desired. Normally 0.0.0.0

NETMASK=255.255.255.0# The proper netmask if needed

# Export them so that they will be available at 'ppp-on-dialer' time.

export TELEPHONE ACCOUNT PASSWORD

# This is the location of the script which dials the phone and logs

# in. Please use the absolute file name as the $PATH variable is not

# used on the connect option. (To do so on a 'root' account would be

# a security hole so don't ask.)

DIALER_SCRIPT=/home/a/ppp/ppp-on-dialer

# Initiate the connection

# I put most of the common options on this command. Please, don't

# forget the 'lock' option or some programs such as mgetty will not

# work. The asyncmap and escape will permit the PPP link to work with

# a telnet or rlogin connection. You are welcome to make any changes

# as desired. Don't use the 'defaultroute' option if you currently

# have a default route to an ethernet gateway.

exec /usr/sbin/pppd debug lock modem /dev/ttyS0 115200 \

asyncmap 20A0000 escape FF kdebug 0 $LOCAL_IP:$REMOTE_IP \

noipdefault netmask $NETMASK defaultroute connect $DIALER_SCRIPT

exec /usr/sbin/pppd debug lock modem /dev/ttyS0 115200 \

asyncmap 20A0000 escape FF kdebug 0 $LOCAL_IP:$REMOTE_IP \

noipdefault netmask $NETMASK defaultroute connect $DIALER_SCRIPT这个命令的作用是：（可以使用manpppd查看帮助）

运行/usr/sbin/pppd程序，给它传入命令行参数的意义是：

/dev/ttyS0:拨号所用的MODEM所连接的串口（ttyS0是串口1，ttyS1是串口2...)

115200:MODEM的通信速率（57600BPS)

modem :用MODEM进行拨号。

nocrtscts:无流控

lock :锁定这个设备

debug ：输出调试信息

defaultroute :此拨号连接作为默认路由 connect /home/a/ppp/ppp-on-dialer:使用/home/a/ppp/ppp-on-dialer进行拨号

/home/a/ppp/ppp-on-dialer

#!/bin/sh

# This is part 2 of the ppp-on script. It will perform the connection

# protocol for the desired connection.

exec chat -v\

TIMEOUT3\

ABORT'\nBUSY\r'\

ABORT'\nNO ANSWER\r'\

ABORT'\nRINGING\r\n\r\nRINGING\r'\

''\rAT\

'OK-+++\c-OK'ATH0\

TIMEOUT30\

OKAT+IPR=115200\

OKAT+CGDCONT=1,"IP","CMNET"\

OKAT+CGACT=1,1\

OKATDT*99***1#\

CONNECT''\

#ogin:--ogin:$ACCOUNT\

#assword:$PASSWORD

chat命令的帮助请参考man-achat查看。

ABORTBUSY

ABORTERROR

ABORTNOCARRIER

ABORTNODIALTONE

ABORTRING

<--------如果遇到MODEM回应"BUSY","ERROR","NOCARRIER","NODIALTONE"则立即报错并退出拨号。

""AT

<--------外送"AT"命令。

OKAT+IPR=115200

<--------设置波特率。

"OK""AT+CGDCONT=1,“ip”，“cmnet”

<---当判到“OK"回应时，外送AT+CGDCONT=1,"ip","cmnet"命令。设置GPRS接人网关。其中CMNET为移动梦网的接人网关 OKAT+CGACT=1,1 <--------激活GPRS功能，如果返回OK，则GPRS连接成功;如果返回ERROR则意味着GPRS失败。这时候应该检查一下SIM卡的GPRS业务是否已经开通，GPRS模块天线是否安装正确等问题。

"OK""ATDT*99***1#" <---当判到“OK"回应时，外送拨号ATDT*99***1#命令。

"CONNECT" <---当判到“CONNECT"回应时，拨号结束，程序退出。

/home/a/ppp/ppp-off

#!/bin/sh

##############################################

# Determine the device to be terminated.

if [ "$1" = "" ]; then

DEVICE=ppp0

else

DEVICE=$1

fi ###############################################

# If the ppp0 pid file is present then the program is #running. Stop it.