嵌入式linux加载无线网卡方法

          有一张威盛无线网卡，闲着蛋疼，挂载了一下。

          具体方法如下：

1、网上找到无线网卡驱动：vntwusb.ko;

2、加载无线网卡驱动：insmod vntwusb.ko;

[root@FriendlyARM plg]# insmod vntwusb.ko 
VIA Networking Wireless LAN USB Driver Ver. 1.20.03
VIA Networking Wireless LAN USB Driver Ver. 1.20.03
Copyright (c) 2004 VIA Networking Technologies, Inc.
usb 1-1: reset full speed USB device using s3c2410-ohci and address 2
usbcore: registered new interface driver vntwusb

    

3、查看无线网卡：   iwconfig

[root@FriendlyARM plg]# iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

eth1      802.11-a/b/g  ESSID:""  
          Mode:Managed  Frequency=2.412 GHz  Access Point: Not-Associated   
          Bit Rate:1 Mb/s   Sensitivity=0/255  
          Retry min limit:8   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

vntwpa    no wireless extensions.

4、打开网卡：       ifconfig eth1 up

[root@FriendlyARM plg]# ifconfig eth1 up
Config_FileOperation file Not exist
Zone=[2][E][U]!!
Antenna MAIN available!

5、扫描无线网络：iwlist eth1 scanning

[root@FriendlyARM plg]# iwlist eth1 scanning
eth1      Scan completed :
          Cell 01 - Address: 00:23:CD:15:60:40
                    ESSID:"TP-LINK"
                    Mode:Managed
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=50/100  Signal level=-70 dBm  Noise level=0 dBm
                    Encryption key:off
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:bcn_int=100
          Cell 02 - Address: 00:23:89:97:BC:10
                    ESSID:"H3C"
                    Mode:Managed
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=65/100  Signal level=-64 dBm  Noise level=0 dBm
                    Encryption key:off
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
                              11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:bcn_int=100
          Cell 03 - Address: 00:23:89:97:BC:11
                    ESSID:"touzi-net"
                    Mode:Managed
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=65/100  Signal level=-64 dBm  Noise level=0 dBm
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
                              11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:bcn_int=100
          Cell 04 - Address: F4:EC:38:7B:5F:FE
                    ESSID:"chengang"
                    Mode:Managed
                    Channel:6
                    Frequency:2.437 GHz (Channel 6)
                    Quality=100/100  Signal level=-40 dBm  Noise level=0 dBm
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:bcn_int=100
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK

     

6、扫描到无线网络后（这里是H3C），连接无密钥无线网络：iwconfig eth1 essid H3C

[root@FriendlyARM plg]# iwconfig eth1 essid H3C
[root@FriendlyARM plg]# AP(BSS) finding:Found a AP(BSS)..
802.11 Authen (OPEN) Successful.
Association Successful, AID=6.
Link with AP(SSID): H3C

   

7、连接好后，可以查看下无线网络：iwconfig eth1

[root@FriendlyARM plg]# iwconfig eth1
eth1      802.11-a/b/g  ESSID:"H3C"  
          Mode:Managed  Frequency=2.412 GHz  Access Point: 00:23:89:97:BC:10   
          Bit Rate=1 Mb/s   Sensitivity=-60 dBm  
          Retry min limit:8   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=88/100  Signal level:-60 dBm  Noise level:0 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

8、设置eth1的ip地址，网关，DNS（H3C的网关为192.168.254.1，DNS为202.96.134.133）

[root@FriendlyARM plg]# ifconfig eth1 192.168.254.245 netmask 255.255.255.0
[root@FriendlyARM plg]# route add default gw 192.168.254.1
[root@FriendlyARM plg]# echo "nameserver 202.96.134.133">> /etc/resolv.conf 

    注意：这里修改的值，在下次reboot后就没有了，如果要彻底修改的话，在linux系统中，可以用vi修改：vi /etc/sysconfig/network-scripts/ifcfg-eth0（修改这个在下次reboot后生效）。但是 嵌入式linux下面没有sysconfig这个目录，因此，具体方法看12。

9、修改完成后，就可以ping下网关了：

[root@FriendlyARM plg]# ping 192.168.254.1 -I eth1
PING 192.168.254.1 (192.168.254.1): 56 data bytes
64 bytes from 192.168.254.1: seq=0 ttl=128 time=10.732 ms
64 bytes from 192.168.254.1: seq=1 ttl=128 time=3.418 ms
64 bytes from 192.168.254.1: seq=2 ttl=128 time=4.078 ms
64 bytes from 192.168.254.1: seq=3 ttl=128 time=4.095 ms
64 bytes from 192.168.254.1: seq=4 ttl=128 time=10.198 ms

10、然后ping下外网看看，这里ping下google：

[root@FriendlyARM plg]# ping www.google.com -I eth1
PING www.google.com (74.125.71.105): 56 data bytes
64 bytes from 74.125.71.105: seq=0 ttl=51 time=16.472 ms
64 bytes from 74.125.71.105: seq=1 ttl=51 time=18.067 ms
64 bytes from 74.125.71.105: seq=3 ttl=51 time=14.123 ms
64 bytes from 74.125.71.105: seq=4 ttl=51 time=13.120 ms
64 bytes from 74.125.71.105: seq=5 ttl=51 time=14.130 ms

11、上面是加载无密钥的ap，那么如果ap有密钥应该怎么办呢？这就要在linux下面查看下iwconfig这个命令的用法了。用man查看下这个命令。

[root@localhost ~]# man iwconfig

     可以知道，这个命令加载有密钥（密钥为ccavccav）的方式如下：

[root@FriendlyARM plg]# iwconfig eth1 essid chengang key ccavccav 

    但是，iwconfig只能加载密钥为wep的ap点，不能加载密钥为wpa的ap点。如果要加载wpa的ap点，就得用wpa_supplicant这个工具了。

12、关于嵌入式linux开机加载驱动和修改ip的方法：

   可以修改/etc/init.d/rcS这个开机启动脚本，将上面这些命令加载到这些脚本里面。就不用每次开机都要配置了。