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我想通过 sim900 gsm 调制解调器连接我的树莓系统以连接互联网，因为我使用 wvdial 方法连接互联网我的 wvdial 配置文件如下

[Dialer play]
Modem = /dev/ttyUSB0
Baud = 9600
Init1 = ATH
Init2 = ATE1
Init3 = AT+CGDCONT=1,"IP","airtelgprs.com"
Dial Command = ATD
Phone = *99#
Stupid mode = yes
Username = ""
Password = ""

如果我使用上述配置连接 3g usb 调制解调器，则输出屏幕如下所示

pi@raspbmc:~$ --> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATH
ATH
OK
--> Sending: ATE1
ATE1
OK
--> Sending: AT+CGDCONT=1,"IP","internet"
AT+CGDCONT=1,"IP","internet"
OK
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
CONNECT
--> Carrier detected.  Starting PPP immediately.
--> Starting pppd at Fri Jun 14 22:35:19 2013
--> Pid of pppd: 3145
--> Using interface ppp0
--> pppd: Ęy
--> pppd: Ęy
--> pppd: Ęy
--> pppd: Ęy
--> pppd: Ęy
--> pppd: Ęy
--> pppd: Ęy
--> local  IP address 10.133.163.246
--> pppd: Ęy
--> remote IP address 10.64.64.64
--> pppd: Ęy
--> primary   DNS address 89.108.202.20
--> pppd: Ęy
--> secondary DNS address 89.108.195.20
--> pppd: Ęy

它已连接到互联网，但通过对 sim900 gsm 调制解调器使用相同的命令，输出屏幕如下所示

pi@raspbmc:~$ --> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATH
ATH
OK
--> Sending: ATE1
ATE1
OK
--> Sending: AT+CGDCONT=1,"IP","internet"
AT+CGDCONT=1,"IP","internet"
OK
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
CONNECT
--> Carrier detected.  Starting PPP immediately.
--> Starting pppd at Fri Jun 14 22:35:19 2013
--> Pid of pppd: 3145
--> Using interface ppp0

那是它是连接但本地IP地址，远程IP地址，主DNS地址，辅助DNS地址未分配所以我无法浏览互联网请帮助我如何解决这个问题给我指导解决这个问题提前谢谢

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