[root@localhost ~]# dhclient -r
[root@localhost ~]# dhclient
vi /etc/

[root@localhost ~]# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:93:47:04 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.16/24 brd 192.168.1.255 scope global dynamic ens33
       valid_lft 84782sec preferred_lft 84782sec
    inet6 fe80::bbca:2655:139:aa19/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
 

查看網絡路由網關是否正確

[root@localhost ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 ens33
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 ens33
192.168.1.0     0.0.0.0         255.255.255.0   U     100    0        0 ens33
 

vi /etc/sysconfig/network-scripts/ifcfg-ens33
        TYPE=Ethernet
        PROXY_METHOD=none
        BROWSER_ONLY=no
        BOOTPROTO=dhcp
        DEFROUTE=yes
        IPV4_FAILURE_FATAL=no
        IPV6INIT=yes
        IPV6_AUTOCONF=yes
        IPV6_DEFROUTE=yes
        IPV6_FAILURE_FATAL=no
        IPV6_ADDR_GEN_MODE=stable-privacy
        NAME=ens33
        UUID=4aa87787-3b5c-4985-9b43-24f247fc71c1
        DEVICE=ens33
        ONBOOT=yes #原始為no 改為yes
 

重啟網絡服務

 systemclt restart network.service

CentOS 7.5 運維之路之網絡配置