centos無線網卡配置

centos 無線網卡配置


自己有台不常用的筆記本，是centos系統，一次不小心按了Fn，結果就沒有網路了，後來是各種折騰，終於搞定，留個筆記。
1、查看驅動是否還在
$ lspci | grep Network
07:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
如果出現網卡資訊，就是驅動正常，配置錯誤

2、查看網卡狀態
$ ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 7c:4f:b5:73:b4:be
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
$ iwconfig wlan0
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
tips 如果Tx-Power = off 需要 開啟無線網卡電源
iwconfig wlan0 txpower on

3、掃描網路
$ sudo iwlist wlan0 scan
wlan0 Scan completed :
Edited to only show the relevant network
Cell 04 - Address: 00:16:01:12:E7:5E
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=64/70 Signal level=-46 dBm
Encryption key:off
ESSID:"aprk"
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=00000000b6d6419d
Extra: Last beacon: 224ms ago
IE: Unknown: 0009666F6F626172776562
IE: Unknown: 010882848B962430486C
IE: Unknown: 030106
IE: Unknown: 2A0102
IE: Unknown: 2F0102
IE: Unknown: 32040C121860
IE: Unknown: DD090010180201F0000000
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00

4、設定網路
$ sudo iwconfig wlan0 essid "aprk"
查看ssid設定是否成功
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr=2347 B Fragment thr:off
Encryption key:off
Power Management:off
設定失敗，這個地方反覆出現問題，嘗試添加參數
sudo iwconfig wlan0 key open mode Managed essid "aprk" channel 6
查看ssid設定是否成功
$ sudo iwconfig wlan0 # check to see if settings took hold this time
wlan0 IEEE 802.11bgn ESSID:"aprk"
Mode:Managed Frequency:2.437 GHz Access Point: Not-Associated
Tx-Power=20 dBm
Retry long limit:7 RTS thr=2347 B Fragment thr:off
Encryption key:off
Power Management:off
network預設支援wep加密，建議先設定無需密碼，以後在重新添加

5、啟用dhcp，擷取ip並串連
$ sudo dhclient -v wlan0
Internet Systems Consortium DHCP Client 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/


Listening on LPF/wlan0/7c:4f:b5:73:b4:be
Sending on LPF/wlan0/7c:4f:b5:73:b4:be
Sending on Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 17
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 15
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9
No DHCPOFFERS received.
No working leases in persistent database - sleeping.


6、連網成功
安裝networkmanager，這個可以有圖形介面，不用在以來命令列折騰
$ sudo yum install NetworkManager NetworkManager-gnome #這雷根據自己的案頭環境自己調整

7、最後
路由器給wifi加上密碼，電腦reboot，之後就會出現網路設定表徵圖，搞定！