嵌入式Linux加載無線網卡方法

有一張威盛無線網卡，掛載了一下，具體方法如下：

1、網上找到無線網卡驅動：vntwusb.ko;

2、加載無線網卡驅動：insmod vntwusb.ko;

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

3、查看無線網卡： iwconfig

1. [root@ www.linuxidc.com plg]# iwconfig
2. lo no wireless extensions.
4. eth0 no wireless extensions.
6. eth1 802.11-a/b/g ESSID:""
7. Mode:Managed Frequency=2.412 GHz Access Point: Not-Associated
8. Bit Rate:1 Mb/s Sensitivity=0/255
9. Retry min limit:8 RTS thr:off Fragment thr:off
10. Encryption key:off
11. Power Management:off
12. Link Quality:0 Signal level:0 Noise level:0
13. Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
14. Tx excessive retries:0 Invalid misc:0 Missed beacon:0
16. vntwpa no wireless extensions.

4、打開網卡： ifconfig eth1 up

1. [root@ www.linuxidc.com plg]# ifconfig eth1 up
2. Config_FileOperation file Not exist
3. Zone=[2][E][U]!!
4. Antenna MAIN available!

5、掃描無線網絡：iwlist eth1 scanning

1. [root@ www.linuxidc.com plg]# iwlist eth1 scanning
2. eth1 Scan completed :
3. Cell 01 - Address: 00:23:CD:15:60:40
4. ESSID:"TP-LINK"
5. Mode:Managed
6. Channel:1
7. Frequency:2.412 GHz (Channel 1)
8. Quality=50/100 Signal level=-70 dBm Noise level=0 dBm
9. Encryption key:off
10. Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
11. 12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
12. 48 Mb/s; 54 Mb/s
13. Extra:bcn_int=100
14. Cell 02 - Address: 00:23:89:97:BC:10
15. ESSID:"H3C"
16. Mode:Managed
17. Channel:1
18. Frequency:2.412 GHz (Channel 1)
19. Quality=65/100 Signal level=-64 dBm Noise level=0 dBm
20. Encryption key:off
21. Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
22. 11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
23. 48 Mb/s; 54 Mb/s
24. Extra:bcn_int=100
25. Cell 03 - Address: 00:23:89:97:BC:11
26. ESSID:"touzi-net"
27. Mode:Managed
28. Channel:1
29. Frequency:2.412 GHz (Channel 1)
30. Quality=65/100 Signal level=-64 dBm Noise level=0 dBm
31. Encryption key:on
32. Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
33. 11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
34. 48 Mb/s; 54 Mb/s
35. Extra:bcn_int=100
36. Cell 04 - Address: F4:EC:38:7B:5F:FE
37. ESSID:"chengang"
38. Mode:Managed
39. Channel:6
40. Frequency:2.437 GHz (Channel 6)
41. Quality=100/100 Signal level=-40 dBm Noise level=0 dBm
42. Encryption key:on
43. Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
44. 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
45. 48 Mb/s; 54 Mb/s
46. Extra:bcn_int=100
47. IE: IEEE 802.11i/WPA2 Version 1
48. Group Cipher : CCMP
49. Pairwise Ciphers (1) : CCMP
50. Authentication Suites (1) : PSK

6、掃描到無線網絡後（這裡是H3C），連接無密鑰無線網絡：iwconfig eth1 essid H3C

1. [root@ www.linuxidc.com plg]# iwconfig eth1 essid H3C
2. [root@ www.linuxidc.com plg]# AP(BSS) finding:Found a AP(BSS)..
3. 802.11 Authen (OPEN) Successful.
4. Association Successful, AID=6.
5. Link with AP(SSID): H3C

7、連接好後，可以查看下無線網絡：iwconfig eth1

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

8、設置eth1的ip地址，網關，DNS（H3C的網關為192.168.254.1，DNS為202.96.134.133）

1. [root@ www.linuxidc.com plg]# ifconfig eth1 192.168.254.245 netmask 255.255.255.0
2. [root@ www.linuxidc.com plg]# route add default gw 192.168.254.1
3. [root@ www.linuxidc.com plg]# echo "nameserver 202.96.134.133">> /etc/resolv.conf

注意：這裡修改的值，在下次reboot後就沒有了，如果要徹底修改的話，在linux系統中，可以用vi修改：vi /etc/sysconfig/network-scripts/ifcfg-eth0（修改這個在下次reboot後生效）。但是 嵌入式linux下面沒有sysconfig這個目錄，因此，具體方法看12。

9、修改完成後，就可以ping下網關了：

1. [root@ www.linuxidc.com plg]# ping 192.168.254.1 -I eth1
2. PING 192.168.254.1 (192.168.254.1): 56 data bytes
3. 64 bytes from 192.168.254.1: seq=0 ttl=128 time=10.732 ms
4. 64 bytes from 192.168.254.1: seq=1 ttl=128 time=3.418 ms
5. 64 bytes from 192.168.254.1: seq=2 ttl=128 time=4.078 ms
6. 64 bytes from 192.168.254.1: seq=3 ttl=128 time=4.095 ms
7. 64 bytes from 192.168.254.1: seq=4 ttl=128 time=10.198 ms

10、然後ping下外網看看，這裡ping下Linuxidc.com：

1. [root@ www.linuxidc.com plg]# ping www.linuxidc.com -I eth1
2. PING www.google.com (74.125.71.105): 56 data bytes
3. 64 bytes from 74.125.71.105: seq=0 ttl=51 time=16.472 ms
4. 64 bytes from 74.125.71.105: seq=1 ttl=51 time=18.067 ms
5. 64 bytes from 74.125.71.105: seq=3 ttl=51 time=14.123 ms
6. 64 bytes from 74.125.71.105: seq=4 ttl=51 time=13.120 ms
7. 64 bytes from 74.125.71.105: seq=5 ttl=51 time=14.130 ms

11、上面是加載無密鑰的ap，那麼如果ap有密鑰應該怎麼辦呢？這就要在linux下面查看下iwconfig這個命令的用法了。用man查看下這個命令。

[root@localhost ~]# man iwconfig

可以知道，這個命令加載有密鑰（密鑰為ccavccav）的方式如下：

[root@ www.linuxidc.com plg]# iwconfig eth1 essid chengang key ccavccav

但是，iwconfig只能加載密鑰為wep的ap點，不能加載密鑰為wpa的ap點。如果要加載wpa的ap點，就得用wpa_supplicant這個工具了。

12、關於嵌入式linux開機加載驅動和修改ip的方法：

可以修改/etc/init.d/rcS這個開機啟動腳本，將上面這些命令加載到這些腳本裡面。就不用每次開機都要配置了。