Centos7配置单网卡，多IP
暂时配置
ifconfig ens33:0 192.168.80.101 netmask 255.255.255.0 up
永久配置
复制一份原有的网卡配置文件，以 identifier:number来表示网卡
修改内容如下，注意NAME和DEVICE
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
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=ens33:0
DEVICE=ens33:0
ONBOOT=yes
IPADDR=192.168.80.101
NETMASK=255.255.255.0
GATEWAY=192.168.80.2
重启网络即可，systemclt restart network
如果手动ifconfig ens33:0 down, 重新使用ifconfig ens33:0 up就会报错。由于MAC地址重复了
SIOCSIFFLAGS: Cannot assign requested address
解决方法
手动分配一个MAC地址
ifconfig ens33:0 hw class address
Debian配置
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.168.80.200
netmask 255.255.255.0
broadcast 192.168.80.255
network 192.168.80.0
gateway 192.168.80.2
auto eth0:1
iface eth0:1 inet static
address 192.168.80.230
netmask 255.255.255
broadcast 192.168.80.255