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
- # This is pppd script for China Mobile, used Huawei GTM900-B GPRS Module
- # Usage: root>pppd call gprs
- /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-failure 12
- #lcp-echo-interval 3
- #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
- # chat script for China Mobile, used HuaWei GTM900-B GPRS module.
- TIMEOUT 15
- ABORT "DELAYED"
- ABORT "BUSY"
- ABORT "ERROR"
- ABORT "NO DIALTONE"
- ABORT "NO CARRIER"
- TIMEOUT 40
- '' \rAT
- OK ATS0=0
- OK ATE0V1
- OK AT+CGDCONT=1,"IP","CMNET"
- OK ATDT*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
- #client server secret IP address
- "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:
- ABORT OK
- ABORT BUSY
- ABORT DELAYED
- ABORT "NO ANSWER"
- ABORT "NO CARRIER"
- ABORT "NO DIALTONE"
- ABORT VOICE
- ABORT ERROR
- ABORT RINGING
- TIMEOUT 12
- "" \\k\\k\\k\\d+++ATH
- "使用: 将PC上的DNS删掉后运行如下:
- [root@localhost ppp]# pppd call gprs
- timeout set to 15 seconds
- abort on (DELAYED)
- abort on (BUSY)
- abort on (ERROR)
- abort on (NO DIALTONE)
- abort on (NO CARRIER)
- timeout set to 40 seconds
- send (^MAT^M)
- expect (OK)
- ^M^M
- OK
- -- got it
- send (ATS0=0^M)
- expect (OK)
- ^M
- AT^M
- OK
- -- got it
- send (ATE0V1^M)
- expect (OK)
- ^M
- ATS0=0^M^M
- OK
- -- got it
- send (AT+CGDCONT=1,"IP","CMNET"^M)
- expect (OK)
- ^M
- ATE0V1^M^M
- OK
- -- got it
- send (ATDT*99***1#^M)
- expect (CONNECT)
- ^M
- ^M
- OK^M
- ^M
- CONNECT
- -- got it
- send (^M)
- Serial connection established.
- using channel 42
- Using interface ppp0
- Connect: ppp0 <--> /dev/ttyS0
- sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x8c5e3d45> <pcomp> <accomp>]
- rcvd [LCP ConfRej id=0x1 <magic 0x8c5e3d45>]
- sent [LCP ConfReq id=0x2 <asyncmap 0x0> <pcomp> <accomp>]
- rcvd [LCP ConfAck id=0x2 <asyncmap 0x0> <pcomp> <accomp>]
- rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MD5> <pcomp> <accomp>]
- sent [LCP ConfAck id=0x1 <asyncmap 0x0> <auth chap MD5> <pcomp> <accomp>]
- rcvd [CHAP Challenge id=0x1 <fb17db52a81bc14997f72e2932ab0b342bab961d49c611>, name = ""]
- sent [CHAP Response id=0x1 <2c757eac52b8d9a7d80ca7a77c419ad9>, name = "cmnet"]
- rcvd [CHAP Success id=0x1 ""]
- CHAP authentication succeeded
- sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15>]
- sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
- rcvd [LCP ProtRej id=0x1 80 fd 01 01 00 0c 1a 04 78 00 18 04 78 00]
- rcvd [IPCP ConfReq id=0x1 <addr 221.177.160.163>]
- sent [IPCP ConfAck id=0x1 <addr 221.177.160.163>]
- rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01>]
- sent [IPCP ConfReq id=0x2 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
- rcvd [IPCP ConfNak id=0x2 <addr 10.165.226.25> <ms-dns1 211.137.64.163> <ms-dns3 211.136.20.203>]
- sent [IPCP ConfReq id=0x3 <addr 10.165.226.25> <ms-dns1 211.137.64.163> <ms-dns3 211.136.20.203>]
- rcvd [IPCP ConfAck id=0x3 <addr 10.165.226.25> <ms-dns1 211.137.64.163> <ms-dns3 211.136.20.203>]
- local IP address 10.165.226.25
- remote IP address 221.177.160.163
- primary DNS address 211.137.64.163
- secondary DNS address 211.136.20.203
再将这里的DNS给PC或作个连接到/etc/ppp/resolf.conf应该就OK了.
