Linux ip address modification method

Ifconfig command for viewing network card information (the network card uses eth0 ~ EthN name ). In addition, it is only possible for the root user. It is generally unavailable for common users.
Route-n command to view the route.
Cat/etc/resolv. conf to view DNS, configure DNS in this file
There are three methods to modify the IP address in the command line, one of which is temporary and no longer available after restart. Only two valid permanently:
1. In the command line, you can call up graphical interface configuration through commands, which is intuitive and easy to configure:
Command
Setup
In the displayed graphic interface, select network configuration ----> press ENTER ----->. The first option is the NIC, and the second option is DNS. Too many writes, most importantly, intuitive.
After the configuration is complete, click the TAB key or press OK ----> save ---> save & quit ---> quit

2. Write a configuration file in the command line. Generally, your Nic is eth0.
# Vi/etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE = eth0 # describe the DEVICE alias for the NIC, for example, it is eth0 in the ifcfg-eth0 File
BOOTPROTO = static # Set the way for the NIC to obtain the IP address. The possible options are static, dhcp, or bootp, which respectively correspond to the IP address specified by the static state and the IP address obtained through the dhcp protocol, IP addresses obtained through the bootp protocol
BROADCAST = 192.168.0.255 # corresponding subnet BROADCAST address
HWADDR = 00: 07: E9: 05: E8: B4 # physical address of the corresponding Nic
IPADDR = 192.168.0.2 # If you set the method for obtaining the IP address from the NIC to static, this field specifies the IP address of the NIC.
IPV6INIT = no
IPV6_AUTOCONF = no
NETMASK = 255.255.255.0 # network mask corresponding to the network adapter
NETWORK = 192.168.0.0 # NETWORK address of the NIC
ONBOOT = yes # whether to set this network interface when the system starts. If it is set to yes, the device is activated when the system starts.

Modify the gateway configuration file of the corresponding Nic
Vi/etc/sysconfig/network
NETWORKING = yes (indicates whether the system uses the network, which is generally set to yes. If it is set to no, the network cannot be used, and many system service programs cannot be started)
HOSTNAME = localhost (set the Host Name of the local machine. The host name set here must correspond to the host name set in/etc/hosts)
GATEWAY = 192.168.1.1 (set the IP address of the GATEWAY connected to the local machine .)