3G 拨号问题
环境Linux3.0.13G模块ZTE AC2726 电信CDMA2000
1..插上3G模块后，/dev下增加一个usbdev1.1，并没有出现ttyUSB0~ttyUSB4.使用./pppd call cdma2000,提示
# pwd
/opt/3G/bin
# ./pppd call cdma2000
./pppd: In file /etc/ppp/peers/cdma2000: unrecognized option '/dev/ttyUSB0'
2.应该是驱动没有正常安装。但是运行官方提供的3GDialup后，系统就会提示
# usb 1-1: usbfs: process 135 (usb_modeswitch) did not claim i
nterface 0 before use
usb 1-1: USB disconnect, device number 2
usb 1-1: new full speed USB device number 7 using s3c2410-ohci
usb 1-1: New USB device found, idVendor=19d2, idProduct=fff1
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1: Product: ZTE CDMA Tech
usb 1-1: Manufacturer: ZTE, Incorporated
pl2303 1-1:1.0: pl2303 converter detected
usb 1-1: pl2303 converter now attached to ttyUSB0
pl2303 1-1:1.1: pl2303 converter detected
usb 1-1: pl2303 converter now attached to ttyUSB1
pl2303 1-1:1.2: pl2303 converter detected
usb 1-1: pl2303 converter now attached to ttyUSB2
pl2303 1-1:1.3: pl2303 converter detected
usb 1-1: pl2303 converter now attached to ttyUSB3
pl2303 1-1:1.4: pl2303 converter detected
usb 1-1: pl2303 converter now attached to ttyUSB4
scsi1 : usb-storage 1-1:1.5
scsi 1:0:0:0: Direct-Access ZTE USB Storage FFF1 2.31 PQ: 0 ANSI: 2
sd 1:0:0:0: Attached scsi generic sg0 type 0
sd 1:0:0:0: Attached SCSI removable disk
能将usb1.1转换为ttyUSB0~4,而且拨号成功
3.然后在/dev下就有了ttyUSB0~4
4.然后再使用./pppd call cdma2000拨号就能成功。
第一个问题：不知到3GDialup怎么将usb转换为ttyUSB0~4的？我用手动安装如何实现
第二个问题：不管是手动连接还是3GDialup，当连接上之后如果ping www.baidu.com都能成功，只要一直ping不停止，连接一直保持，一旦停止ping等等1，2秒，就会断开连接，提示如下64 bytes from 119.75.218.77: seq=153 ttl=53 time=59.448 ms
64 bytes from 119.75.218.77: seq=154 ttl=53 time=122.508 ms
64 bytes from 119.75.218.77: seq=155 ttl=53 time=77.247 ms
^C
--- www.baidu.com ping statistics ---
156 packets transmitted, 156 packets received, 0% packet loss
round-trip min/avg/max = 59.448/88.407/441.169 ms
# Modem hangup
Connect time 3.0 minutes.
Sent 13222 bytes, received 13308 bytes.
Connection terminated.
连接中止了，好像超时了？然后再ifconfig
64 bytes from 119.75.218.77: seq=153 ttl=53 time=59.448 ms
64 bytes from 119.75.218.77: seq=154 ttl=53 time=122.508 ms
64 bytes from 119.75.218.77: seq=155 ttl=53 time=77.247 ms
^C
--- www.baidu.com ping statistics ---
156 packets transmitted, 156 packets received, 0% packet loss
round-trip min/avg/max = 59.448/88.407/441.169 ms
# Modem hangup
Connect time 3.0 minutes.
Sent 13222 bytes, received 13308 bytes.
Connection terminated.
+ Done(16) ./pppd call cdma2000
# ifconfig
# 帮忙给看看！打你们电话真难！ 另外我想用代码实现拨号，并且返回获得的IP地址，应该怎么做？ 第一个问题解决了，通过分析官方的3GDiaup代码发现，其执行了一个命令./usb_modeswitch -c usb_modeswitch.d/19d2^%fff5 -W 实现了USB到串口的处理。 明白了 通过分析官方3GDialog代码发现，其实就是执行了两条命令
1.首先通过读取/sys/bus/usb/devices/1-1/idVendor和/sys/bus/usb/devices/1-1/idProduct获得设备Vid和Pid
2.然后执行./usb_modeswitch -c usb_modeswitch.d/19d2^%fff5 -W命令（其中19d2为Vid和fff5为Pid）实现usb串口的映射
3.然后执行/opt/3G/bin/pppd call cdma2000实现拨号
4.其中状态框中的内容就是从终端上读出的内容放到了文本框中（不知道这句话对不对） 就剩下最后一个问题了，网络拨通之后不和某个Server保持连接，自动就会断开。如果一直ping 某个server也不会断，一旦停止ping ，停几秒就断。提示如次：
PAP authentication succeeded
localIP address 1.198.20.80
remote IP address 115.168.79.5
primary DNS address 222.85.85.85
secondary DNS address 222.88.88.88
# ping www.baidu.com
PING www.baidu.com (220.181.111.147): 56 data bytes
64 bytes from 220.181.111.147: seq=0 ttl=53 time=73.823 ms
64 bytes from 220.181.111.147: seq=1 ttl=53 time=79.310 ms
^C
--- www.baidu.com ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 73.823/76.566/79.310 ms
# Modem hangup
Connect time 0.5 minutes.
Sent 286 bytes, received 356 bytes.
Connection terminated. 关注楼主问题……
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