ubuntu 网络配置相关

http://forum.ubuntu.org.cn/viewtopic.php?t=445210

https://help.ubuntu.com/community/WifiDocs/Adhoc

http://www.linuxjournal.com/content/wi-fi-command-line

http://wireless.kernel.org/en/users/Documentation/iw/replace-iwconfig

https://wiki.archlinux.org/index.php/Ad-hoc_networking

http://jwalanta.blogspot.hk/2010/02/internet-connection-sharing-ics-in.html