linux有gprs也有線怎麽選擇

默

認情況在/etc/ppp/目錄下建立文件gprs-connect-chat，內容如下（每個參數解釋在ppp-howto中有詳細解釋。它是在ppp

底層會話的時候給chat進程的參數每行是壹個“期望/發送”的組合序列。當出現壹些經典的錯誤如： "LCP: timeout sending

Config-Requests" ，"serial line is not 8 bit clean...",“serial line is

looped

back”等，去參看方式2提到的兩個文檔，或者google。註意，為什麽不能確切地給出解決的方式，原因是打印出來的同壹個錯誤信息，我稱之為現象，

同壹現象可能是由很多種原因造成的，需要自己實地排查。）

#/etc/ppp/gprs-connect-chat

TIMEOUT 15

ABORT '\nBUSY\r'

ABORT '\nNO ANSWER\r'

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

#'' AT

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

TIMEOUT 40

'' \rAT

OK ATS0=0 #這些都是標準的at命令，建議查看隨模塊的at命令手冊

OK ATE0V1

OK AT+CGDCONT=1,"IP","CMNET" #設置isp接入網關為中國移動的cmnet，如果妳想獲得更多訪問資源的話

OK ATDT*99***1# #中國移動gprs的接入號嗎

CONNECT ''

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

建立文件/etc/ppp/peers/gprs，它的作用是給pppd進程提供配置參數（詳見man 8 pppd的輸出內容，如果出現問題這個將是非常重要的參考頁），內容如下：

#/etc/ppp/peers/gprs

# Usage: root>pppd call gprs

/dev/s3c2410_serial1 #改成自己的端口名

115200 #改成自己串口波特率

nocrtscts

#可能妳的串口是需要crtscts，硬件流控的，這是由妳的串口決定的，壹般嵌入式系統的串口沒有帶硬件流控，也不需要就加nocrtscts

modem #這個參數使得pppd進程將等待模塊發回的CD (Carrier Detect)信號，與local真好相反

#noauth

debug #把調試信息輸出到/var/log/messages，在調試成功後去掉它，以減少垃圾的產生。

nodetach

#hide-password

usepeerdns #以下的3個參數壹般不可少

noipdefault

defaultroute

user smsong #設置接入的用戶名，在chap-secrets或者pap-secets中使用

0.0.0.0:0.0.0.0 #本地和遠端的ip都設為0使得接入的isp分配本地的ip地址

ipcp-accept-local #要求peer也就是isp給自己非配動態的IP地址

#ipcp-accept-remote

#lcp-echo-failure 12

#lcp-echo-interval 3

noccp #不需要壓縮控制協議，有可能對端不需要，根據自己的isp的情況

#novj

#novjccomp

persist #保證在連接斷開的情況下不退出，並嘗試重新打開連接

connect '/usr/sbin/chat -s -v -f /etc/ppp/gprs-connect-chat'

#pppd調用chat會話進程接入對端isp，啟動對端的pppd，然後本地pppd與對端的pppd壹起進行協

#商網絡參數和chap/pap認證，成功後，再進行ncp層的ip的分配。

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

#/etc/ppp/chap-secets

# Secrets for authentication using CHAP

# client server secret IP addresses

####### redhat-config-network will overwrite this part!!! (begin) ##########

####### redhat-config-network will overwrite this part!!! (end) ############

smsong * 123456 *

有點地區的GPRS可能使用pap方式認證接入用戶，所以在同壹級目錄下，創建pap-secets文件，內容與chap-secets類似有4項的內容第2和第4項壹般不限制就用*（星號）代表。反正要妳在/etc/ppp/下放著這兩個文件就好。

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

在建立了ppp0連接以後可以使用ctrl+c或者下面的腳本程序ppp-off斷開ppp連接

#/etc/ppp/ppp-off

#!/bin/sh

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

# Determine the device to be terminated.

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

DEVICE=ppp0

else

DEVICE=$1

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

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

if [ -r /var/run/$DEVICE.pid ]; then

kill -INT `cat /var/run/$DEVICE.pid`

# If the kill did not work then there is no process running for this

# pid. It may also mean that the lock file will be left. You may wish

# to delete the lock file at the same time.

if [ ! "$?" = "0" ]; then

rm -f /var/run/$DEVICE.pid

echo "ERROR: Removed stale pid file"

exit 1

# Success. Let pppd clean up its own junk.

echo "PPP link to $DEVICE terminated."

exit 0

# The ppp process is not running for ppp0

echo "ERROR: PPP link is not active on $DEVICE"

exit 1

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

做好上面的配置以後，輸入pppd call gprs命令，註意如果妳的gprs這個文件不在/etc/ppp/peers/目錄下，在給出標註路徑給pppd

[root@localhost ppp_scripts]# pppd call gprs

timeout set to 15 seconds

abort on (\nBUSY\r)

abort on (\nNO ANSWER\r)

abort on (\nRINGING\r\n\r\nRINGING\r)

timeout set to 40 seconds

send (^MAT^M^M)

expect (OK)

^M^M

-- got it

send (ATS0=0^M^M)

expect (OK)

AT^M

-- got it

send (ATE0V1^M^M)

expect (OK)

^M^M

-- got it

send (AT+CGDCONT=1,"IP","CMNET"^M^M)

expect (OK)

ATS0=0^M^M

-- got it

send (ATDT*99***1#^M^M)

expect (CONNECT)

^M^M

OK^M

ATE0V1^M^M

OK^M

CONNECT

-- got it

send (^M)

Serial connection established.

using channel 20

Using interface ppp0

Connect: ppp0 /dev/ttyS0

Warning - secret file /etc/ppp/pap-secrets has world and/or group access

sent [LCP ConfReq id=0x1 ]

rcvd [LCP ConfRej id=0x1 ]

sent [LCP ConfReq id=0x2 ]

rcvd [LCP ConfAck id=0x2 ]

rcvd [LCP ConfReq id=0x1 ]

sent [LCP ConfAck id=0x1 ]

rcvd [CHAP Challenge id=0x1 , name = ""]

Warning - secret file /etc/ppp/chap-secrets has world and/or group access

sent [CHAP Response id=0x1 , name = "smsong"]

rcvd [CHAP Success id=0x1 ""]

CHAP authentication succeeded

sent [CCP ConfReq id=0x1 ]

sent [IPCP ConfReq id=0x1 ]

rcvd [LCP ProtRej id=0x1 80 fd 01 01 00 0c 1a 04 78 00 18 04 78 00]

Protocol-Reject for 'Compression Control Protocol' (0x80fd) received

rcvd [IPCP ConfReq id=0x1]

sent [IPCP ConfNak id=0x1 ]

rcvd [IPCP ConfRej id=0x1 ]

sent [IPCP ConfReq id=0x2 ]

rcvd [IPCP ConfReq id=0x2]

sent [IPCP ConfAck id=0x2]

rcvd [IPCP ConfNak id=0x2 ]

sent [IPCP ConfReq id=0x3 ]

rcvd [IPCP ConfAck id=0x3 ]

Could not determine remote IP address: defaulting to 10.64.64.64

local IP address 10.144.202.159

remote IP address 10.64.64.64

primary DNS address 211.138.200.69

secondary DNS address 211.103.13.101

Script /etc/ppp/ip-up started (pid 4578)

Script /etc/ppp/ip-up finished (pid 4578), status = 0x0

使用ctrl+c可以斷開連接，這樣壹般不太好測試是不是連接上了（遇有開發不上的控制臺只有壹個的原因），可以去掉/etc/ppp

/peers/gprs文件中的nodetach參數，要用ping，妳需要將eth0即網口給禁用掉，這樣ping才會通過ppp0端口尋找路由連接外

網。

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

可以用命令tail -f /var/log/messages看到日誌：

Mar 20 20:55:55 localhost pppd[4557]: pppd 2.4.4 started by root, uid 0

Mar 20 20:55:56 localhost chat[4558]: timeout set to 15 seconds

Mar 20 20:55:56 localhost chat[4558]: abort on (\nBUSY\r)

Mar 20 20:55:56 localhost chat[4558]: abort on (\nNO ANSWER\r)

Mar 20 20:55:56 localhost chat[4558]: abort on (\nRINGING\r\n\r\nRINGING\r)

Mar 20 20:55:56 localhost chat[4558]: timeout set to 40 seconds

Mar 20 20:55:56 localhost chat[4558]: send (^MAT^M^M)

Mar 20 20:55:56 localhost chat[4558]: expect (OK)

Mar 20 20:55:56 localhost chat[4558]: ^M^M

Mar 20 20:55:56 localhost chat[4558]: OK

Mar 20 20:55:56 localhost chat[4558]: -- got it

Mar 20 20:55:56 localhost chat[4558]: send (ATS0=0^M^M)

Mar 20 20:55:56 localhost chat[4558]: expect (OK)

Mar 20 20:55:56 localhost chat[4558]: ^M

Mar 20 20:55:56 localhost chat[4558]: AT^M

Mar 20 20:55:56 localhost chat[4558]: OK

Mar 20 20:55:56 localhost chat[4558]: -- got it

Mar 20 20:55:56 localhost chat[4558]: send (ATE0V1^M^M)

Mar 20 20:55:56 localhost chat[4558]: expect (OK)

Mar 20 20:55:56 localhost chat[4558]: ^M

Mar 20 20:55:56 localhost chat[4558]: ^M^M

Mar 20 20:55:56 localhost chat[4558]: OK

Mar 20 20:55:56 localhost chat[4558]: -- got it

Mar 20 20:55:56 localhost chat[4558]: send (AT+CGDCONT=1,"IP","CMNET"^M^M)

Mar 20 20:55:57 localhost chat[4558]: expect (OK)