CentOS Network Configuration Example

1. Configure DNSVim/etc/resolv.conf

NameServer 192.168.0.1
NameServer 8.8.8.8

NameServer 8.8.4.4

2. Configure the Gateway route add default GW 192.168.1.1 Dev eno*

This changes the gateway to 192.168.1.1 , which is only temporary, when you restart the system or network card, it will be back to the original gateway. To make permanent changes, you need to modify /etc/sysconfig/network This file, the main content of this file (you do not have the file, you can manually add):

vim/etc/sysconfig/network

Networking=yes #表示系统是否使用网络, generally set to Yes. If set to No, the network is not available.

Hostname=centos #设置本机的主机名, the host name set here corresponds to the hostname set in/etc/hosts

gateway=192.168.1.1 #设置本机连接的网关的IP地址.

3. Configure the IP addressvim/etc/sysconfig/network-scripts/ifcfg-eno*

hwaddr=00:0c:29:8d:24:73
Type=ethernet
Bootproto=static #启用静态IP地址
Defroute=yes
Peerdns=yes
Peerroutes=yes
Ipv4_failure_fatal=no
Ipv6init=yes
Ipv6_autoconf=yes
Ipv6_defroute=yes
Ipv6_peerdns=yes
Ipv6_peerroutes=yes
Ipv6_failure_fatal=no
name=eno16777736
Uuid=ae0965e7-22b9-45aa-8ec9-3f0a20a85d11
Onboot=yes #开启自动启用网络连接
ipaddr0=192.168.21.128 #设置IP地址
Prefixo0=24 #设置子网掩码
gateway0=192.168.21.2 #设置网关
dns1=8.8.8.8 #设置主DNS
dns2=8.8.4.4 #设置备DNS
: wq! #保存退出

4. Set the host name to www

Vim/etc/hostname #编辑配置文件

www #修改localhost. Localdomain for www

Vim/etc/hosts #编辑配置文件

127.0.0.1 localhost www #修改localhost. localdomain for www

5. Restart the service

IP link set eth0 UPI # Open Nic
IP link set eth0 down # close the NIC

Service Network restart

6. Supplementary order

IP [Options] Action object {Link|addr|route ...}

# IP Link Show # Displays network interface information
# IP Link set eth0 UPI # Open Nic
# IP Link set eth0 down # close NIC
# IP Link set eth0 promisc on # open NIC Mixed mode
# IP Link Set eth0 promisc offi # Turn off the network card mix mode
# IP Link Set eth0 txqueuelen 1200 # set NIC Queue Length
# IP Link Set eth0 MTU 1400 # set NIC Maximum transmission unit
# IP Addr Show # Displays network card IP information
# ip addr Add 192.168.0.1/24 dev eth0 # set eth0 NIC IP address 192.168.0.1
# ip addr del 192.168.0.1/24 dev eth0 # remove eth0 NIC IP address

# IP Route List # view routing information
# IP route add 192.168.4.0/24 via 192.168.0.254 Dev eth0 # Set the gateway for 192.168.4.0 segment to 192.168.0.254, Data walk eth0 interface
# IP route add default via 192.168.0.254 Dev Eth0 # to set the defaults gateway to 192.168.0.254
# ip Route del 192.168.4.0/24 # Remove gateway for 192.168.4.0 network segment
# IP Route del Default # to delete the defaults route

CentOS Network Configuration Example