centos6.5安装使用usb无线网卡并配置静态ip

系统：centos6.5

usb网卡：EDUP USB无线网卡 EP-N8508GS

1、检查无线网卡设备

#lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter

上面最后一行说明该网卡已经被系统检测到了

2、检查内核是否正确加载到该网卡模块

# iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0    IEEE 802.11bgn  ESSID:"TP-LINK_25D5"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: 88:25:93:6E:25:D5   
          Bit Rate=72.2 Mb/s   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr=2347 B   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=70/70  Signal level=-38 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

上面显示的wlan0这块内容，说明内核已加载到该网卡模块，如果没有显示无线网卡的标识（这里是wlan0），那么需要去安装相应的网卡驱动程序

3、开启无线网卡，利用iwlist命令探测无线网络

# ifconfig wlan0 up
# iwlist wlan0 scan
wlan0     Scan completed :
          Cell 01 - Address: E8:39:DF:C0:BC:A4
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=54/70  Signal level=-56 dBm  
                    Encryption key:on
                    ESSID:"123"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=00000002d736346b
                    Extra: Last beacon: 218ms ago
                    IE: Unknown: 0003313233
                    IE: Unknown: 010882848B962430486C
                    IE: Unknown: 030101
                    IE: Unknown: 0706555320010E14
                    IE: Unknown: 200100
                    IE: Unknown: 23021000
                    IE: Unknown: 2A0100
                    IE: Unknown: 2F0100
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                    IE: Unknown: 32040C121860
                    IE: Unknown: 2D1A2C1817FF00000000000000000000000000000000000000000000
                    IE: Unknown: 3D1601080400000000000000000000000000000000000000
                    IE: Unknown: 4A0E14000A002C01C800140005001900
                    IE: Unknown: 7F080100000000000040
                    IE: Unknown: DD090010180201000C0000
                    IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
          Cell 02 - Address: 88:25:93:6E:25:D5
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=70/70  Signal level=-40 dBm  
                    Encryption key:off
                    ESSID:"TP-LINK_25D5"
                    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
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=000001fba281937d
                    Extra: Last beacon: 136ms ago
                    IE: Unknown: 000C54502D4C494E4B5F32354435
                    IE: Unknown: 010882848B960C121824
                    IE: Unknown: 030101
                    IE: Unknown: 2A0100
                    IE: Unknown: 32043048606C
                    IE: Unknown: 2D1AAC011BFFFFFF0000000000000000000100000000000000000000
                    IE: Unknown: 3D1601050500000000000000000000000000000000000000
                    IE: Unknown: 4A0E14000A002C01C800140005001900
                    IE: Unknown: 7F080100000000000040
                    IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
                    IE: Unknown: DD0900037F01010000FF7F

这里使用扫描到的Cell 02无线网络，也就是“ TP-LINK_25D5”是本无线网卡下面需要连接的无线网络名称

注意：这里我的无线网卡没有设置密码

4、连接无线网络，并使用iwconfig查看连接是否成功

# iwconfig wlan0 essid "TP-LINK_25D5"
# iwconfig
lo        no wireless extensions.


eth0      no wireless extensions.


wlan0     IEEE 802.11bgn  ESSID:"TP-LINK_25D5"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: 88:25:93:6E:25:D5 

ESSID显示为TP-LINK_25D5，说明连接成功

5、设置无线网卡ip参数

# vim /etc/sysconfig/network-scripts/ifcfg-wlan0
DEVICE=wlan0
NAME=wlan0
HWADDR=e8:4e:06:35:59:ad
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes
ESSID=TP-LINK_25D5
IPV6INIT=no
IPV4_FAILURE_FATAL=yes
NETMASK=255.255.255.0
GATEWAY=10.79.32.1
IPADDR=10.79.32.27
NM_CONTROLLED=yes
USERCTL=no
PEERDNS=yes

6、重新启动网络服务

# /etc/init.d/network restart
Shutting down interface eth0:                              [  OK  ]
Shutting down interface wlan0:                             [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  Determining if ip address 10.79.32.22 is already in use for device eth0...
                                                           [  OK  ]
Bringing up interface wlan0:  Determining if ip address 10.79.32.27 is already in use for device wlan0...
                                                           [  OK  ]

参考资料：

《鸟哥的linux私房菜-服务器架设篇》

ifconfig、ifup与ifdown命令用法---http://www.jbxue.com/LINUXjishu/21350.html

centos无线网卡配置----http://www.2cto.com/os/201401/273745.html