前面的内容，我们都讲解了PPP协议的一些基本应用，以及一些相关的配置。那么这里我们就主要讲解一下实现Linux下pppd通过GPRS拨号上网的过程。昨天把开发板的bootloader删了,没办法,只得在PC上调GPRS拨号了.先在windows下拨号成功,然后用工具看拨号时具体使用了哪些AT命令,再使用这些命令到linux下使用pppd来拨号,最后终于成功了,之前开发板上不能成功拨号极有可就是AT指令有问题,现在只有等开发板回来后再到ARM7上调了.

下面贴一下拨号使用的几个脚本,GPRS模块是使用的华为的GTM900-B:

1, /etc/ppp/peers/gprs: 复制内容到剪贴板

代码:

#/etc/ppp/peers/gprs 
#ThisispppdscriptforChinaMobile,usedHuaweiGTM900-BGPRSModule 
#Usage:root>pppdcallgprs 
/dev/ttyS0 
19200 
crtscts 
modem 
#noauth 
debug 
nodetach 
#hide-password 
usepeerdns 
noipdefault 
defaultroute 
user"cmnet" 
0.0.0.0:0.0.0.0 
#ipcp-accept-local 
#ipcp-accept-remote 
#lcp-echo-failure12 
#lcp-echo-interval3 
#noccp 
#novj 
#novjccomp 
#persist 
connect'/usr/sbin/chat-s-v-f/etc/ppp/gprs-connect-chat' 
#connect'/bin/chat-v-s-f/etc/ppp/gprs-connect-chat' 
#disconnect'/bin/chat-v-f/etc/ppp/gprs-disconnect-chat'2

gprs-connect-chat: 复制内容到剪贴板

代码:

#/etc/ppp/gprs-connect-chat 
#chatscriptforChinaMobile,usedHuaWeiGTM900-BGPRSmodule. 
TIMEOUT15 
ABORT"DELAYED" 
ABORT"BUSY" 
ABORT"ERROR" 
ABORT"NODIALTONE" 
ABORT"NOCARRIER" 
TIMEOUT40 
''\rAT 
OKATS0=0 
OKATE0V1 
OKAT+CGDCONT=1,"IP","CMNET" 
OKATDT*99***1# 
CONNECT''3

用于chap认证的密码文件:chap-secrets,由于移动的GPRS服务不需要用户名和密码,所以刚开始没设用户名和密码,结果在chap认证的时候总不能通过.后来在gprs里添加user "cmnet"和这个密码文件后就OK了. 复制内容到剪贴板

代码:

#/etc/ppp/chap-secrets 
#clientserversecretIPaddress 
"cmnet"*"cmnet"*4
另外还有个可选的,断开连接的脚本如下:复制内容到剪贴板

代码:

ABORTOK 
ABORTBUSY 
ABORTDELAYED 
ABORT"NOANSWER" 
ABORT"NOCARRIER" 
ABORT"NODIALTONE" 
ABORTVOICE 
ABORTERROR 
ABORTRINGING 
TIMEOUT12 
""\\k\\k\\k\\d+++ATH 
"使用:将PC上的DNS删掉后运行如下: 
[root@localhostppp]#pppdcallgprs 
timeoutsetto15seconds 
aborton(DELAYED) 
aborton(BUSY) 
aborton(ERROR) 
aborton(NODIALTONE) 
aborton(NOCARRIER) 
timeoutsetto40seconds 
send(^MAT^M) 
expect(OK) 
^M^M 
OK 
--gotit 
send(ATS0=0^M) 
expect(OK) 
^M 
AT^M 
OK 
--gotit 
send(ATE0V1^M) 
expect(OK) 
^M 
ATS0=0^M^M 
OK 
--gotit 
send(AT+CGDCONT=1,"IP","CMNET"^M) 
expect(OK) 
^M 
ATE0V1^M^M 
OK 
--gotit 
send(ATDT*99***1#^M) 
expect(CONNECT) 
^M 
^M 
OK^M 
^M 
CONNECT 
--gotit 
send(^M) 
Serialconnectionestablished. 
usingchannel42 
Usinginterfaceppp0 
Connect:ppp0<-->/dev/ttyS0 
sent[LCPConfReqid=0x1<asyncmap0x0><magic0x8c5e3d45><pcomp><accomp>] 
rcvd[LCPConfRejid=0x1<magic0x8c5e3d45>] 
sent[LCPConfReqid=0x2<asyncmap0x0><pcomp><accomp>] 
rcvd[LCPConfAckid=0x2<asyncmap0x0><pcomp><accomp>] 
rcvd[LCPConfReqid=0x1<asyncmap0x0><authchapMD5><pcomp><accomp>] 
sent[LCPConfAckid=0x1<asyncmap0x0><authchapMD5><pcomp><accomp>] 
rcvd[CHAPChallengeid=0x1<fb17db52a81bc14997f72e2932ab0b342bab961d49c611>,name=""] 
sent[CHAPResponseid=0x1<2c757eac52b8d9a7d80ca7a77c419ad9>,name="cmnet"] 
rcvd[CHAPSuccessid=0x1""] 
CHAPauthenticationsucceeded 
sent[CCPConfReqid=0x1<deflate15><deflate(old#)15>] 
sent[IPCPConfReqid=0x1<compressVJ0f01><addr0.0.0.0><ms-dns10.0.0.0><ms-dns30.0.0.0>] 
rcvd[LCPProtRejid=0x180fd0101000c1a04780018047800] 
rcvd[IPCPConfReqid=0x1<addr221.177.160.163>] 
sent[IPCPConfAckid=0x1<addr221.177.160.163>] 
rcvd[IPCPConfRejid=0x1<compressVJ0f01>] 
sent[IPCPConfReqid=0x2<addr0.0.0.0><ms-dns10.0.0.0><ms-dns30.0.0.0>] 
rcvd[IPCPConfNakid=0x2<addr10.165.226.25><ms-dns1211.137.64.163><ms-dns3211.136.20.203>] 
sent[IPCPConfReqid=0x3<addr10.165.226.25><ms-dns1211.137.64.163><ms-dns3211.136.20.203>] 
rcvd[IPCPConfAckid=0x3<addr10.165.226.25><ms-dns1211.137.64.163><ms-dns3211.136.20.203>] 
localIPaddress10.165.226.25 
remoteIPaddress221.177.160.163 
primaryDNSaddress211.137.64.163 
secondaryDNSaddress211.136.20.203

再将这里的DNS给PC或作个连接到/etc/ppp/resolf.conf应该就OK了.