进入Linux之后插上无线网卡不能识别，怎么办？

工作的大体思路如下：

用iwconfig开启无线网卡的电源，并查找区域内的无线网络

连接到相应的无线网络

通过ifconfig启用无线网卡，并获取IP（如果使用DHCP）

注意：

假设无线被识别为wlan0，如果的网卡没有被识别为wlan0，可以在 *** 作时做相应的修改。

具体过程

1、 打开无线网卡电源

iwconfig wlan0 txpower on

无线网络的信号灯应该亮了。

2、 列出区域内的无线网络

iwlist wlan0 scan

3、 假设要连接到网络MyHome（即essid为MyHome的网络），那么输入命令

iwconfig wlan0 essid "MyHome"

如果网络是加密的，密码是0123456789，那么就输入命令

iwconfig wlan0 essid "MyHome" key 0123-4567-89

4、 如果正常，输入

iwconfig wlan0

就可以看到连接正常的各项参数了。

5、 启用无线网卡

ifconfig wlan0 up

6、 如果是用DHCP获取IP的，那么用dhclient 或dhcpcd获取ip

dhclient wlan0

或

dhcpcd wlan0

7、 现在无线网卡应该可以正常使用了。

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[root@localhost ~]# cat /etc/wvdial.conf

[Dialer Defaults]

Init1 = ATZ

Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0

Init6 = AT+CFUN =1

Phone = *99#

Idle Seconds = 300

Auto DNS = 0

Password = any

Modem Type = Analog Modem

Stupid Mode = 1

Compuserve = 0

Baud = 115200

New PPPD = yes

Dial Command = ATDT

Ask Password = 0

Init = AT+CGDCONT=1,"IP","3gnet"

ISDN = 0

Username = any

Modem = /dev/ttyUSB1

[root@localhost ~]# cat /etc/ppp/options

noipdefault

ipcp-accept-local

ipcp-accept-remote

defaultroute

noauth

crtscts

debug

dns 220.21.4.130

dns 221.5.88.88

[root@localhost ~]# wvdial

-->WvDial: Internet dialer version 1.61

-->Initializing modem.

-->Sending: AT+CGDCONT=1,"IP","3gnet"

AT+CGDCONT=1,"IP","3gnet"

ERROR

-->Bad init string.

-->Initializing modem.

-->Sending: AT+CGDCONT=1,"IP","3gnet"

AAT+CGDCONT=1,"IP","3gnet"

ERROR

-->Bad init string.

-->Initializing modem.

-->Sending: AT+CGDCONT=1,"IP","3gnet"

AT+CGDCONT=1,"IP","3gnet"

OK

-->Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0

ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0

OK

-->Sending: AT+CFUN =1

AT+CFUN =1

OK

-->Modem initialized.

-->Idle Seconds = 300, disabling automatic reconnect.

-->Sending: ATDT*99#

-->Waiting for carrier.

ATDT*99#

CONNECT 7200000

-->Carrier detected. Starting PPP immediately.

-->Starting pppd at Thu Oct 27 14:45:46 2011

-->Pid of pppd: 2804

-->Using interface ppp0

-->Disconnecting at Thu Oct 27 14:46:16 2011

-->The PPP daemon has died: A modem hung up the phone (exit code = 16)

-->man pppd explains pppd error codes in more detail.

-->Try again and look into /var/log/messages and the wvdial and pppd man pages for more information.

[root@localhost ~]# tail -n 50 /var/log/messages

Oct 27 14:45:38 localhost kernel: [ 1680.465277] usb 1-1: SerialNumber: 1234567890ABCDEF

Oct 27 14:45:39 localhost kernel: [ 1681.196845] scsi4 : usb-storage 1-1:1.2

Oct 27 14:45:39 localhost usb_modeswitch: switched to 1e89:1a20 (USB Modem: USB Modem)

Oct 27 14:45:39 localhost kernel: [ 1681.748929] USB Serial support registered for GSM modem (1-port)

Oct 27 14:45:39 localhost kernel: [ 1681.749378] usbcore: registered new interface driver option

Oct 27 14:45:39 localhost kernel: [ 1681.749386] option: v0.7.2:USB Driver for GSM modems

Oct 27 14:45:39 localhost logger: usb_modeswitch: adding device ID 1e89:1a20 to driver "option"

Oct 27 14:45:39 localhost kernel: [ 1681.759098] option 1-1:1.0: GSM modem (1-port) converter detected

Oct 27 14:45:39 localhost kernel: [ 1681.759462] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0

Oct 27 14:45:39 localhost kernel: [ 1681.759597] option 1-1:1.1: GSM modem (1-port) converter detected

Oct 27 14:45:39 localhost kernel: [ 1681.759871] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1

Oct 27 14:45:39 localhost kernel: [ 1681.760171] option 1-1:1.3: GSM modem (1-port) converter detected

Oct 27 14:45:39 localhost kernel: [ 1681.760714] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2

Oct 27 14:45:40 localhost kernel: [ 1682.199117] scsi 4:0:0:0: Direct-Access USBModem Disk 2.31 PQ: 0 ANSI: 2

Oct 27 14:45:40 localhost kernel: [ 1682.202604] sd 4:0:0:0: Attached scsi generic sg1 type 0

Oct 27 14:45:40 localhost kernel: [ 1682.205810] sd 4:0:0:0: [sdb] Attached SCSI removable disk

Oct 27 14:45:40 localhost mtp-probe: checking bus 1, device 7: "/sys/devices/pci0000:00/0000:00:1d.7/usb1/1-1"

Oct 27 14:45:40 localhost mtp-probe: bus: 1, device: 7 was not an MTP device

Oct 27 14:45:40 localhost modem-manager[818]: <info>(ttyUSB1) opening serial port...

Oct 27 14:45:41 localhost modem-manager[818]: <info>(ttyUSB2) opening serial port...

Oct 27 14:45:41 localhost modem-manager[818]: <info>(ttyUSB0) opening serial port...

Oct 27 14:45:46 localhost kernel: [ 1688.604307] PPP generic driver version 2.4.2

Oct 27 14:45:46 localhost pppd[2804]: pppd 2.4.5 started by suozhang, uid 0

Oct 27 14:45:46 localhost pppd[2804]: Using interface ppp0

Oct 27 14:45:46 localhost lldpad[925]: evb_ifdownort ppp0 remove failed

Oct 27 14:45:46 localhost lldpad[925]: vdp_ifdownpp0 vdp data remove failed

Oct 27 14:45:46 localhost pppd[2804]: Connect: ppp0 <-->/dev/ttyUSB1

Oct 27 14:45:48 localhost modem-manager[818]: <info>(ttyUSB1) closing serial port...

Oct 27 14:45:48 localhost modem-manager[818]: <info>(ttyUSB1) serial port closed

Oct 27 14:45:48 localhost modem-manager[818]: <info>(ttyUSB1) opening serial port...

Oct 27 14:45:55 localhost modem-manager[818]: <info>(ttyUSB2) closing serial port...

Oct 27 14:45:55 localhost modem-manager[818]: <info>(ttyUSB2) serial port closed

Oct 27 14:45:55 localhost modem-manager[818]: <info>(ttyUSB2) opening serial port...

Oct 27 14:45:55 localhost modem-manager[818]: <info>(ttyUSB1) closing serial port...

Oct 27 14:45:55 localhost modem-manager[818]: <info>(ttyUSB1) serial port closed

Oct 27 14:45:59 localhost modem-manager[818]: <info>(ttyUSB0) closing serial port...

Oct 27 14:45:59 localhost modem-manager[818]: <info>(ttyUSB0) serial port closed

Oct 27 14:45:59 localhost modem-manager[818]: <info>(ttyUSB0) opening serial port...

Oct 27 14:46:01 localhost modem-manager[818]: <info>(ttyUSB2) closing serial port...

Oct 27 14:46:01 localhost modem-manager[818]: <info>(ttyUSB2) serial port closed

Oct 27 14:46:02 localhost modem-manager[818]: <info>(ttyUSB0) closing serial port...

Oct 27 14:46:02 localhost modem-manager[818]: <info>(ttyUSB0) serial port closed

Oct 27 14:46:02 localhost modem-manager[818]: <warn>plugin 'Generic' claimed to support tty/ttyUSB0 but couldn't: (-1) (unknown)

Oct 27 14:46:16 localhost pppd[2804]: LCP: timeout sending Config-Requests

Oct 27 14:46:16 localhost pppd[2804]: Connection terminated.

Oct 27 14:46:16 localhost avahi-daemon[743]: Withdrawing workstation service for ppp0.

Oct 27 14:46:16 localhost pppd[2804]: Modem hangup

Oct 27 14:46:16 localhost pppd[2804]: Exit.

Oct 27 14:46:16 localhost lldpad[925]: evb_ifdownort ppp0 remove failed

Oct 27 14:46:16 localhost lldpad[925]: vdp_ifdownpp0 vdp data remove failed

[root@localhost ~]#

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