示例环境：
OS: FC2
NIC: eth0
host name: fc2
ip: 192.168.0.20/24
default gateway: 192.168.0.254
修改ip地址
即时生效:
# ifconfig eth0 192.168.0.20 netmask 255.255.255.0
启动生效:
修改/etc/sysconfig/network-scripts/ifcfg-eth0
修改default gateway
即时生效:
# route add default gw 192.168.0.254
启动生效:
修改/etc/sysconfig/network-scripts/ifcfg-eth0
修改dns
修改/etc/resolv.conf
修改后可即时生效，启动同样有效
修改host name
即时生效:
# hostname fc2
启动生效:
修改/etc/sysconfig/network
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