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方式4:通过无线局域网接入互联网  

2012-04-27 23:19:27|  分类: ubuntu |  标签: |举报 |字号 订阅

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方式4:通过无线局域网接入互联网

  要求安装有无线局域网卡并已驱动

  1.插入无线网卡

  查看一下网络设置,看看是否多出来了两个设备

  $ ifconfig

  eth0      Link encap:Ethernet  HWaddr 00:24:7e:14:a9:a8

  inet6 addr: fe80::224:7eff:fe14:a9a8/64 Scope:Link

  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

  RX packets:11998024 errors:0 dropped:0 overruns:0 frame:0

  TX packets:13667166 errors:0 dropped:0 overruns:0 carrier:0

  collisions:0 txqueuelen:100

  RX bytes:1069420740 (1.0 GB)  TX bytes:3776606487 (3.7 GB)

  Memory:fc200000-fc220000

  eth0:avahi Link encap:Ethernet  HWaddr 00:24:7e:14:a9:a8

  inet addr:169.254.7.73  Bcast:169.254.255.255  Mask:255.255.0.0

  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

  Memory:fc200000-fc220000

  lo        Link encap:Local Loopback

  inet addr:127.0.0.1  Mask:255.0.0.0

  inet6 addr: ::1/128 Scope:Host

  UP LOOPBACK RUNNING  MTU:16436  Metric:1

  RX packets:66657 errors:0 dropped:0 overruns:0 frame:0

  TX packets:66657 errors:0 dropped:0 overruns:0 carrier:0

  collisions:0 txqueuelen:0

  RX bytes:6372151 (6.3 MB)  TX bytes:6372151 (6.3 MB)

  ppp0      Link encap:Point-to-Point Protocol

  inet addr:123.10.130.147  P-t-P:123.10.128.1  Mask:255.255.255.255

  UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1

  RX packets:149828 errors:0 dropped:0 overruns:0 frame:0

  TX packets:122796 errors:0 dropped:0 overruns:0 carrier:0

  collisions:0 txqueuelen:3

  RX bytes:150170347 (150.1 MB)  TX bytes:16349467 (16.3 MB)

  wlan0     Link encap:Ethernet  HWaddr 00:22:fa:94:48:56

  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)

  wmaster0  Link encap:UNSPEC  HWaddr 00-22-FA-94-48-56-00-00-00-00-00-00-00-00-

  00-00

  UP BROADCAST RUNNING 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)

  只要看见eth0就说明网卡设备设别出来了,eth0就是无线网卡设备的名字了,至于其他,暂不研究。

  2.确认无线网卡的型号

  $ lspci

  ......

  00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network

  Connection (rev 03)

  ......

  上面的Intel Corporation 82567LM Gigabit Network Connection (rev 03)就是无线网卡芯片

  的型号了。

 

  3.打开无线网卡电源

  $ sudo iwconfig eth0 txpower on

  4.检索区域内的无线网络

  $ iwlist eth0 scan

  eth0      Scan completed :

  Cell 01 - Address: 00:1D:0F:4D:8B:E4

  ESSID:"TP-LINK"

  Mode:Master

  Frequency:2.437 GHz (Channel 6)

  Quality=28/70  Signal level=-67 dBm  Noise level=-95 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

  Extra:ath_ie=dd0900037f01010008ff7f

  Cell 02 - Address: 00:21:27:3A:37:0A

  ESSID:"TP-LINK"

  Mode:Master

  Frequency:2.437 GHz (Channel 6)

  Quality=12/70  Signal level=-83 dBm  Noise level=-95 dBm

  Encryption key:on

  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

  Extra:ath_ie=dd0900037f01010008ff7f

  Cell 03 - Address: 00:18:39:A6:98:E2

  ESSID:"linksys"

  Mode:Master

  Frequency:2.437 GHz (Channel 6)

  Quality=3/70  Signal level=-92 dBm  Noise level=-95 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: WPA Version 1

  Group Cipher : CCMP

  Pairwise Ciphers (1) : CCMP

  Authentication Suites (1) : PSK

  我附近有三个无线AP,ESSID所标记的就是无线AP的名字了,其中有两个无线AP都叫做 TP-LINK,另一个叫

  linksys,记下这几个无线AP的名字,一会得挨个试。

  5.连接无线AP

  $ sudo iwconfig ath0 essid "linksys"

  $ ifconfig

  不管连上还是连不上都不会给出任何提示,到底连没连上还需要使用命令查看一下才行

  $ iwconfig eth0

  eth0      IEEE 802.11g  ESSID:"linksys"  Nickname:""

  Mode:Managed  Frequency:2.462 GHz  Access Point: Not-Associated

  Bit Rate:0 kb/s   Tx-Power:18 dBm   Sensitivity=1/1

  Retry:off   RTS thr:off   Fragment thr:off

  Power Management:off

  Link Quality=0/70  Signal level=-95 dBm  Noise level=-95 dBm

  Rx invalid nwid:8172  Rx invalid crypt:0  Rx invalid frag:0

  Tx excessive retries:0  Invalid misc:0   Missed beacon:0

  上面的黑体字的部分说明没有连接成功,没关系再换一个就是了。

  $ sudo iwconfig eth0 essid "TP-LINK"

  $ ifconfig

  执行后再查看一下接入状态

  $ iwconfig eth0

  eth0      IEEE 802.11g  ESSID:"TP-LINK"  Nickname:""

  Mode:Managed  Frequency:2.437 GHz  Access Point: 00:1D:0F:4D:8B:E4

  Bit Rate:36 Mb/s   Tx-Power:18 dBm   Sensitivity=1/1

  Retry:off   RTS thr:off   Fragment thr:off

  Power Management:off

  Link Quality=26/70  Signal level=-69 dBm  Noise level=-95 dBm

  Rx invalid nwid:8268  Rx invalid crypt:0  Rx invalid frag:0

  Tx excessive retries:0  Invalid misc:0   Missed beacon:0

  ok,总算是连上了。

  注意:如果连接AP需要密码,而你确实也知道AP的密码,那么可以用下面的办法连接

  假设密码是 123456789,密码需要四位一组用”-“分开。

  $ sudo iwconfig ath0 essid "TP-LINK" key 1234-5678-9

  6.启用无线网卡

  $ sudo ifconfig ath0 up

  7.设置无线网卡采用dhcp方式自动获取ip

  $ sudo dhclient ath0

  Internet Systems Consortium DHCP Client V3.0.6

  Copyright 2004-2007 Internet Systems Consortium.

  All rights reserved.

  For info, please visit http://www.isc.org/sw/dhcp/

  wifi0: unknown hardware address type 801

  wifi0: unknown hardware address type 801

  Listening on LPF/ath0/00:19:e0:85:73:70

  Sending on   LPF/ath0/00:19:e0:85:73:70

  Sending on   Socket/fallback

  DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 6

  DHCPOFFER of 192.168.1.104 from 192.168.1.1

  DHCPREQUEST of 192.168.1.104 on ath0 to 255.255.255.255 port 67

  DHCPACK of 192.168.1.104 from 192.168.1.1

  bound to 192.168.1.104 -- renewal in 3125 seconds.

  现在就可以拔掉网线,使用无线网卡上网了。

  8.断开网络

  如果需要断开网络,可以使用下面的命令

  $ sudo ifconfig ath0 down

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