CnentOS7 1. Installation related 1.3 Network card configuration

View network interface information:

ifconfig [network interface name]

Network Interface:

eth0: the name of the first ethernet card

lo: loopback network card, non-real network card, virtual network interface, IP is always 127.0.0.1, used to provide network support within Linux when there is no physical network card.

Note: In centos7, instead of using ifconfig, use the ip command to view network information

ip addr

Network card configuration storage directory:

/etc/sysconfig/network-scripts/ifcfg-ens33

NIC restart command:

Start the network card: ifup ens33
Stop the network card: ifdown ens33
Restart the network card: serice network restart is equivalent to service network restart

Network card configuration:

TYPE="Ethernet"
#Configure static dchp, static
#BOOTPROTO=dhcp|static|none
BOOTPROTO="static"
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"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="ens33"
UUID="00b1ba4d-9b5c-47db-96fd-1317aad5488e"
DEVICE="ens33"
ONBOOT="yes"
#网卡IP地址
IPADDR="192.168.5.120"
#子网掩码
NETMASK="255.255.255.0"
#默认网关
GATEWAY="192.168.5.1"
#DNS配置
DNS1="192.168.5.1"