在Linux更改 IP / netmask / geteway / DNS

1. 修改 IP address
A. ifconfig eth0 192.168.0.55 netmask 255.255.255.0

B. vi /etc/sysconfig/network-scripts/ifcfg-eth0

    DEVICE=eth0
    BOOTPROTO=static (or dhcp)
    BROADCAST=192.168.0.255
    IPADDR=192.168.0.55
    NETMASK=255.255.255.0
    GATEWAY=192.168.0.1
    ONBOOT=yes

查看結果
ifconfig -a eth0


2. 修改 default gateway

A. route add default gw 192.168.0.1

B. vi /etc/sysconfig/network-scripts/ifcfg-eth0
   GATEWAY=192.168.0.1


3. 修改 DNS

vi /etc/resolv.conf
search
nameserver 8.8.8.8 (first)
nameserver 8.8.4.4 (second)


4. 重新啟動網路服務
/etc/init.d/network restart
或
ifdown eth0;ifup eth0 (針對網卡停用啟動)