CentOS配置网卡子接口

配置网卡子接口

正常情况，只有一块网卡，这里的网卡名为 enp0s25，但有时候需要多个IP配置在一个服务器上，就需要网卡子接口实现

[root@host-0 network-scripts]# ls
ifcfg-enp0s25    ifdown       ......
......

复制这个网卡配置文件并改名为enp0s25:0 , enp0s25:1

需要几个子接口就复制几个文件

cp ifcfg-enp0s25 ifcfg-enp0s25:0
cp ifcfg-enp0s25 ifcfg-enp0s25:1
......

将子接口的配置文件的 NAME 和 DEVICE 改名为和网卡配置文件一样的名称，每个子接口的ip地址要不一样

[root@host-0 network-scripts]# cat ifcfg-enp0s25:0
TYPE=Ethernet
BOOTPROTO=static
DEVICE=enp0s25:0
NAME=enp0s25:0
ONBOOT=yes
IPADDR=10.10.10.200
NETMASK=255.255.255.0

重启网络服务

systemctl restart network

可以看到ip已经生效

[root@host-0 network-scripts]# ifconfig 
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.20  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::6af7:28ff:fe2e:e230  prefixlen 64  scopeid 0x20<link>
        ether 68:f7:28:2e:e2:30  txqueuelen 1000  (Ethernet)
        RX packets 553217  bytes 301601649 (287.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 482998  bytes 61025212 (58.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xf0600000-f0620000  

enp0s25:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.10.10.200  netmask 255.255.255.0  broadcast 10.10.10.255
        ether 68:f7:28:2e:e2:30  txqueuelen 1000  (Ethernet)
        device interrupt 20  memory 0xf0600000-f0620000  

......

[root@host-0 network-scripts]# ping 10.10.10.200
PING 10.10.10.200 (10.10.10.200) 56(84) bytes of data.
64 bytes from 10.10.10.200: icmp_seq=1 ttl=64 time=0.051 ms
64 bytes from 10.10.10.200: icmp_seq=2 ttl=64 time=0.066 ms
64 bytes from 10.10.10.200: icmp_seq=3 ttl=64 time=0.058 ms
^C
--- 10.10.10.200 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.051/0.058/0.066/0.008 ms

删除子接口

将 ifcfg-xxx:n 配置文件删除
重启网路服务

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