ubuntu 3 G 网卡配置颇为费劲，根据步骤1配置完成后，有时候能连，有时候连接不成功，后来请教同事后才得以解决，这里仅分享解决方法，不保证对其它类型网卡有效。
步骤一：配置无线网络
配置无线网络，如下图:
备注：根据网上的资料，配置完以上后，发现有时能上网，有时上不了，原因是每次无线网卡的 /dev/ttyUSB 口是不一样的, 而这里没有图形化界面配置，这里可以安装 wvdial 工具，在配置文件中指定 /dev/ttyUSB 口。
步骤二：安装配置 Wvdial
2.1 安装 wvdial
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sudo apt-get install wvdial
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2.2 修改配置文件
修改配置文件，/etc/wvdial.conf，如下：
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[Dialer cdma3g]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init3 = ATE0V1
Init5 = ATS0=0
Init7 = AT+CFUN=1
Modem Type = Analog Modem
ISDN = 0
New PPPD = yes
Phone = #777
Modem = /dev/ttyUSB0
Password = vnet.mobi
Username = ctnet@mycdma.cn
Baud = 4608000
[Dialer cdma1x]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
ISDN = 0
New PPPD = yes
Phone = #777
Modem = /dev/ttyUSB0
Username = CARD
Password = CARD
Baud = 460800
[Dialer shh]
Init3 = ATM0
[Dialer Defaults]
Init1 = ATZ
Stupid Mode = on
Dial Attempts = 1
Password = vnet.mobi
Ask Password = off
Check Def Route = on
Phone = #777
Idle Seconds = 0
Abort on Busy = off
Abort on No Dialtone = on
Modem Type = Analog Modem
Baud = 9600
Auto DNS = on
Dial Command = ATM1L3DT
Modem = /dev/ttyUSB0
Init = ATX0
ISDN = 0
Username = ctnet@mycdma.cn
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Carrier Check = no
Auto Reconnect = on
--2.3 连接测试
francs@francs:~$ sudo wvdial
--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATX0
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATM1L3DT#777
--> Waiting for carrier.
ATM1L3DT#777
CONNECT
--> Carrier detected. Starting PPP immediately.
--> Starting pppd at Mon Dec 23 18:20:19 2013
--> Pid of pppd: 12177
--> Using interface ppp0
--> pppd: [17][7f]
--> pppd: [17][7f]
--> pppd: [17][7f]
--> pppd: [17][7f]
--> local IP address 10.164.207.205
--> pppd: [17][7f]
--> remote IP address 115.168.75.196
--> pppd: [17][7f]
--> primary DNS address 202.101.172.37
--> pppd: [17][7f]
--> secondary DNS address 202.101.173.157
--> pppd: [17][7f]
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备注：如果这步不通，则可以尝试修改 /etc/wvdial.conf 中的 ttyUSB 其它口测试下，在高手苏茶林同学的帮助下，终于搞定了 3G 网卡，这里感谢下。
参考
原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/tech/bigdata/238030.html
