本文共 4999 字，大约阅读时间需要 16 分钟。
1. 系统版本信息 [root@tp ~]# uname -a Linux tp 3.3.4-5.fc17.x86_64 #1 SMP Mon May 7 17:29:34 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux 2. 为防止NetworkManager服务带来干扰，先停止该服务 [root@tp ~]# systemctl stop NetworkManager.service [root@tp ~]# systemctl status NetworkManager.service NetworkManager.service - Network Manager Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled) Active: inactive (dead) since Sun, 12 Aug 2012 22:37:23 +0800; 4s ago Process: 8569 ExecStart=/usr/sbin/NetworkManager --no-daemon (code=exited, status=0/SUCCESS) CGroup: name=systemd:/system/NetworkManager.service Aug 12 22:37:23 tp NetworkManager[8569]: <info> (em1): device state change: ...] Aug 12 22:37:23 tp NetworkManager[8569]: <info> (em1): cleaning up... Aug 12 22:37:23 tp NetworkManager[8569]: <info> (em1): taking down device. Aug 12 22:37:23 tp NetworkManager[8569]: <info> (wlan0): now unmanaged Aug 12 22:37:23 tp NetworkManager[8569]: <info> (wlan0): device state change...] Aug 12 22:37:23 tp NetworkManager[8569]: <info> (wlan0): deactivating device...] Aug 12 22:37:23 tp NetworkManager[8569]: <info> (wlan0): canceled DHCP trans...8 Aug 12 22:37:23 tp NetworkManager[8569]: <info> (wlan0): cleaning up... Aug 12 22:37:23 tp NetworkManager[8569]: <info> (wlan0): taking down device. Aug 12 22:37:23 tp NetworkManager[8569]: <info> exiting (success) 3. 查看连接前的初始状态 [root@tp ~]# ifconfig wlan0 wlan0: flags=4098<BROADCAST,MULTICAST> mtu 1500 ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) RX packets 13547 bytes 13381624 (12.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 12659 bytes 1974514 (1.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@tp ~]# iw wlan0 link Not connected. 4. 获取SSID [root@tp ~]# iw wlan0 scan | grep SSID command failed: Network is down (-100) [root@tp ~]# ifconfig wlan0 up [root@tp ~]# ifconfig wlan0 wlan0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) RX packets 13547 bytes 13381624 (12.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 12659 bytes 1974514 (1.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@tp ~]# iw wlan0 scan | grep SSID SSID: n13u SSID: FAST_Diablo 5. 连接无线加密路由 [root@tp ~]# iw wlan0 connect -w n13u key d:0:'1234567890123' wlan0 (phy #0): connected to bc:ae:c5:7e:ba:fc # 此处对key的写法略作解释：key d:index:data d: default (transmit) key, 默认传输密码 index: 0至3之间的单个数字，我第一次给的是0，能获取到dhcp ip，后面换成其他数字后运行dhclient获取不到ip data: 必须是5或13位的ascii字符，或者10或26位的16进制数字 6. 查看连接完成后无线网卡的状态 [root@tp ~]# iw wlan0 link Connected to bc:ae:c5:7e:ba:fc (on wlan0) SSID: n13u freq: 2412 RX: 9499 bytes (134 packets) TX: 342 bytes (4 packets) signal: -47 dBm tx bitrate: 54.0 MBit/s bss flags: dtim period: 0 beacon int: 100 [root@tp ~]# ifconfig wlan0 wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::62d8:19ff:fecc:7484 prefixlen 64 scopeid 0x20<link> ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) RX packets 13550 bytes 13381882 (12.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 12662 bytes 1974832 (1.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 7.获取无线路由提供的dhcp ip地址 [root@tp ~]# dhclient -r wlan0 #申请前先release [root@tp ~]# dhclient wlan0 [root@tp ~]# ifconfig wlan0 wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.168.139 netmask 255.255.255.0 broadcast 192.168.168.255 inet6 fe80::62d8:19ff:fecc:7484 prefixlen 64 scopeid 0x20<link> ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) RX packets 13567 bytes 13386147 (12.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 12682 bytes 1979923 (1.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 8. 已经可以连通外网 [root@tp ~]# ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. 64 bytes from 8.8.8.8: icmp_req=1 ttl=44 time=338 ms 64 bytes from 8.8.8.8: icmp_req=2 ttl=44 time=362 ms ^C --- 8.8.8.8 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1000ms rtt min/avg/max/mdev = 338.816/350.498/362.181/11.697 ms 9. 断开连接 [root@tp ~]# iw wlan0 disconnect [root@tp ~]# iw wlan0 link Not connected. [root@tp ~]# ifconfig wlan0 wlan0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 192.168.168.139 netmask 255.255.255.0 broadcast 192.168.168.255 inet6 fe80::62d8:19ff:fecc:7484 prefixlen 64 scopeid 0x20<link> ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) RX packets 14214 bytes 13620419 (12.9 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 13375 bytes 2424481 (2.3 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@tp ~]# ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. From 192.168.168.139 icmp_seq=10 Destination Host Unreachable From 192.168.168.139 icmp_seq=11 Destination Host Unreachable From 192.168.168.139 icmp_seq=12 Destination Host Unreachable From 192.168.168.139 icmp_seq=13 Destination Host Unreachable ^C --- 8.8.8.8 ping statistics --- 14 packets transmitted, 0 received, +4 errors, 100% packet loss, time 13001ms pipe 4 [root@tp ~]#转载地址：http://sjtai.baihongyu.com/