Erning.write() » wifi http://erning.net Reloading Fri, 18 Jun 2010 18:05:52 +0000 en hourly 1 http://wordpress.org/?v=3.0 Free wifi http://erning.net/archives/free-wifi http://erning.net/archives/free-wifi#comments Sun, 19 Mar 2006 13:55:50 +0000 erning http://www.erning.net/archives/2006/03/19/free-wifi/ 需要离公司进一点，搬了宿舍，宽带还没有安装好，上网就成了问题。但是我查了一下，无线网络的用户可真多阿，随便找了几个没有设置密码的连接就上来了;-)。而且有的用户的ap/router的管理密码都还是缺省的。

    – 更新: (加些图片)
    USB Wireless Adapter
    阳台上无线信号好的多了

    NAT PC
    有两个无线网卡(一个内置、一个挂在阳台上)的笔记本做NAT服务。

    Home AP
    自己房间里的无线局域网用这个AP

    Workstation
    这样在工作台上的机器无线信号就很好了，上网顺畅;-)

在阳台上的效果要比室内好多了，比如下面的list清单。

dragon ~ # iwlist eth1 scanning
eth1      Scan completed :
          Cell 01 - Address: 00:0A:79:3D:DC:F4
                    ESSID:"corega"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:6
                    Encryption key:off
                    Bit Rates:36 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 11 6 12 24 36
                    Quality=27/100  Signal level=-83 dBm
                    Extra: Last beacon: 140ms ago
          Cell 02 - Address: 00:50:18:23:4F:58
                    ESSID:"CTC"
                    Protocol:IEEE 802.11b
                    Mode:Master
                    Channel:11
                    Encryption key:off
                    Bit Rates:11 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 11
                    Quality=35/100  Signal level=-79 dBm
                    Extra: Last beacon: 30ms ago
          Cell 03 - Address: 00:14:78:AA:8F:DC
                    ESSID:"TP-LINK"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:5
                    Encryption key:on
                    Bit Rates:36 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 11 6 12 24 36
                    Quality=23/100  Signal level=-85 dBm
                    Extra: Last beacon: 170ms ago
          Cell 04 - Address: 00:13:10:CC:FD:8E
                    ESSID:"drwyd"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:2
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 6 9 11 12 18 24 36 48 54
                    Quality=48/100  Signal level=-72 dBm
                    Extra: Last beacon: 10420ms ago
          Cell 05 - Address: 00:15:E9:05:37:E2
                    ESSID:"default"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:6
                    Encryption key:off
                    Bit Rates:54 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 6 9 11 12 18 24 36 48 54
                    Quality=16/100  Signal level=-88 dBm
                    Extra: Last beacon: 130ms ago
          Cell 06 - Address: 00:12:17:24:7F:11
                    ESSID:"MS"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:11
                    Encryption key:off
                    Bit Rates:54 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 6 9 11 12 18 24 36 48 54
                    Quality=16/100  Signal level=-88 dBm
                    Extra: Last beacon: 12130ms ago
          Cell 07 - Address: 00:50:F2:72:B1:68
                    ESSID:"MSHOME"
                    Protocol:IEEE 802.11b
                    Mode:Master
                    Channel:6
                    Encryption key:on
                    Bit Rates:11 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 11
                    Quality=16/100  Signal level=-88 dBm
                    Extra: Last beacon: 11160ms ago
          Cell 08 - Address: 00:0A:EB:CD:5E:02
                    ESSID:"TP-LINK"
                    Protocol:IEEE 802.11b
                    Mode:Master
                    Channel:10
                    Encryption key:off
                    Bit Rates:11 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 11
                    Quality=18/100  Signal level=-87 dBm
                    Extra: Last beacon: 9660ms ago
          Cell 09 - Address: 00:0C:41:B3:30:A4
                    ESSID:"pfc"
                    Protocol:IEEE 802.11b
                    Mode:Master
                    Channel:11
                    Encryption key:off
                    Bit Rates:11 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 11
                    Quality=16/100  Signal level=-88 dBm
                    Extra: Last beacon: 8660ms ago
          Cell 10 - Address: 00:14:78:BF:0A:10
                    ESSID:"TP-LINK"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:6
                    Encryption key:off
                    Bit Rates:36 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 11 6 12 24 36
                    Quality=27/100  Signal level=-83 dBm
                    Extra: Last beacon: 110ms ago
          Cell 11 - Address: 00:C0:02:EF:FD:62
                    ESSID:"905"
                    Protocol:IEEE 802.11b
                    Mode:Master
                    Channel:7
                    Encryption key:on
                    Bit Rates:11 Mb/s
                    Extra: Rates (Mb/s): 1 2 5.5 11
                    Quality=20/100  Signal level=-86 dBm
                    Extra: Last beacon: 100ms ago
]]> http://erning.net/archives/free-wifi/feed 4 Sharing Internet Connection with Two Wireless Adapters http://erning.net/archives/sharing-internet-connection-with-two-wireless-adapters http://erning.net/archives/sharing-internet-connection-with-two-wireless-adapters#comments Fri, 25 Jul 2003 21:13:13 +0000 erning http://www.erning.net/archives/2003/07/26/sharing-internet-connection-with-two-wireless-adapters/ My brother comes to Xiamen for a few days. His laptop and my desktop have to share the single Internet connection. The laptop has a combo wireless adapter and mine has a usb wireless adapter. There’s no access point at my house. We tried to use ad-hoc mode.

First I tried to use windows 2000 as the gateway. The connection between the laptop and the desktop is ok. But the laptop was fail to connect to the Internet either using NAT nor routing directly. The laptop had to surf the web through a proxy.

Switched my destop to linux environment. Simply installed the usb apapter’s driver and enable ip forwarding. The laptop was able to connect to the Internet.

The usb wireless adapter is Linksys WUSB-11 v2.6.
The driver for linux is Atmel AT76C503A-based Wireless Devices.

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