from http://www2.cyut.edu.tw/~s9154610/linux.html#net_basic
上網方式設定
電腦要能夠上網，必須設定以下內容
- ip：設定檔：/etc/sysconfig/network-scripts/ifcfg-eth0
- netmask：設定檔：/etc/sysconfig/network-scripts/ifcfg-eth0
- broadcast：設定檔：/etc/sysconfig/network-scripts/ifcfg-eth0
- gateway：設定檔：/etc/sysconfig/network
- DNS：設定檔：/etc/resolv.conf
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