Linux内核PPP套件设置(1)(2)
ppp套件配置
$(EMB_BIN)/dial-on.sh GPRS启动脚本)
#!/bin/sh
#define dial_on function
dial_on()
{
#test if pppd is running
pppd_stat=`ifconfig|grep ppp|wc -l|cut -b 7-7`
if [ $pppd_stat -gt 0 ]
then
echo "ppp connection's already started."
else
#close ethernet interface
ifconfig eth0 down
#ppp start
pppd modem /dev/ttyS1 57600 nocrtscts lock connect "chat -v -f /etc/ppp/gprs-connect" user "" noauth debug defaultroute
# pppd配置说明:
# ttyS1:连接GPRS模块SIM300的串口
# 57600:GPRS的拨号速率
# nocrtscts:无流控
# lock:锁定设备
# connect “chat –v –f /etc/ppp/gprs-connect”:GPRS连接脚本文件
# user “”:用户名,这里是无
# noauth:无需认证
# debug:输出调试信息
# defaultroute:此拨号连接作为默认路由
echo "ppp is starting..."
fi
}#dial on gprs
dial_on#wait for ppp's init
sleep 5pppd_stat=`ifconfig|grep ppp|wc -l|cut -b 7-7`
if [ $pppd_stat -eq 0 ]
then
echo "trying 2nd time to call ppp"
dial_on
sleep 5
fipppd_stat=`ifconfig|grep ppp|wc -l|cut -b 7-7`
if [ $pppd_stat -eq 0 ]
then
echo "pppd error!"
echo "please check pppd's config files"
fi#open ethernet interface
ifconfig eth0 up#end
$(EMB_BIN)/dial-off.sh 关闭GPRS连接脚本)
#!/bin/sh
#get pppd's pid
pid=`pidof pppd`#if pppd process is running
if [ -n $pid ]
then
#kill pppd
kill $pid
#open the ethernet interface
ifconfig eth0 up
echo "ppp connection is closed."
else
echo "ppp connection isn't existed."
fi#end
$(EMB_ETC)/ppp/gprs-connect GPRS连接配置文件)
#GPRS连接超时设置
TIMEOUT 60
#若MODEM遇到BUSY、ERROR、NO CARRIER等信息时,停止拨号
ABORT "BUSY"
ABORT "ERROR"
ABORT "NO CARRIER"
#外送“AT”指令
'' AT
#当得到“OK”回应时,外送AT+CGDCONT=1,"IP","CMNET"命令
"OK" "AT+CGDCONT=1,\042IP\042,\042CMNET\042"
#当得到“OK”回应时,外送ATDT*99***1#命令
"OK" "ATDT*99***1#"
#当得到“CONNECT”回应时,拨号结束,程序退出
"CONNECT"$(EMB_ETC)/ppp/pap-secrets GPRS认证配置文件)
# Secrets for authentication using PAP
# client server secret IP addresses
'' * '' *
Linux内核PPP设置说明
1) 还需要在$(EMB_ETC)/ppp目录下创建指向$(EMB_ETC)/resolv.conf的链接,用于指定PPP连接的DNS。
2) 在ppp连接时,需要关闭eth连接。在脚本中已经设置好了,首先关闭eth连接,然后进行ppp连接,在ppp连接完成时,再开启eth连接。
3) 最好在系统中开启syslogd进程,这样在/var/log/messages文件中会记录GPRS进行拨号的DEBUG信息,便于调试。
4) 运行拨号脚本后,可以使用#ifconfig查看PPP连接信息。
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