Linux-- card configuration

NIC configuration information

System version: CentOS 6.5

[root@39 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
DEVICE=eth0        # 网卡名称
HWADDR=00:0c:29:b7:75:b9        # Mac地址
TYPE=Ethernet        # 网络类型
UUID=f859baff-38d0-4987-b9e1-1f861ab87a00        # 磁盘唯一标识
ONBOOT=yes            # 是否自启动网卡
NM_CONTROLLED=yes
BOOTPROTO=none        # 网卡获取IP方式
IPADDR=10.0.0.200        # IP地址
NETMASK=255.255.255.0        # 子网掩码
GATEWAY=10.0.0.2        # 网关
DNS1=10.0.0.2        # DNS地址
USERCTL=no   
PEERDNS=yes
IPV6INIT=no

Obtaining IP address

• none: NA protocol guide
• static: statically assigned IP address
• DHCP: Obtain an IP address automatically

Modify the network card configuration file

The first method: using vim configuration file card written in
the second method: using sed command to replace the file or add content to get with the cat command

使配置文件生效，重启单个网卡：
ifdown eth0 && ifup eth0
重启所有网卡：
/etc/init.d/network restart

NIC modify DNS problem

There are two ways to modify DNS:

• The first: to modify the network card configuration file
• The second: modification in /etc/resolv.conf

NIC configuration takes precedence over the /etc/resolv.conf
only modify the network card configuration file to the DNS