以centos7.2为例

centos7服务器主网卡绑定多ip实践演示：
      https://cloud.tencent.com/developer/article/1360461
centos7服务器添加辅助网卡绑定多ip实践演示：
      https://cloud.tencent.com/developer/article/1360462
Windows服务器主网卡绑定多ip实践演示：
      https://cloud.tencent.com/developer/article/1360445
Windows服务器添加辅助网卡及绑定多ip实践演示：
      https://cloud.tencent.com/developer/article/1360457

1）点击实例名

2）分配内网ip

3）绑定弹性公网ip

4）修改网卡配置文件

### 备份
[root@VM_1_62_centos ~]# cp /etc/sysconfig/network-scripts/ifcfg-eth0{,.bak}


### 修改网卡配置
[root@VM_1_62_centos ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0
# Created by cloud-init on instance boot automatically, do not edit.
#
# 此处修改为static
BOOTPROTO=static
DEVICE=eth0
#
# 注释此行
# HWADDR=52:54:00:8a:7a:64
#
# 添加如下几行
#
# 配置主ip
IPADDR0=10.2.1.62
NETMASK0=255.255.255.0
# 配置辅助ip1
IPADDR1=10.2.1.101
NETMASK1=255.255.255.0
# 配置辅助ip2
IPADDR2=10.2.1.102
NETMASK2=255.255.255.0
# 配置网关
GATEWAY=10.2.1.1
#
NM_CONTROLLED=no
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
PERSISTENT_DHCLIENT=yes


### 重启网卡 
[root@VM_1_62_centos ~]# systemctl restart network.service 


### 查看ip
[root@VM_1_62_centos ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:8a:7a:64 brd ff:ff:ff:ff:ff:ff
    inet 10.2.1.62/24 brd 10.2.1.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 10.2.1.101/24 brd 10.2.1.255 scope global secondary eth0
       valid_lft forever preferred_lft forever
    inet 10.2.1.102/24 brd 10.2.1.255 scope global secondary eth0
       valid_lft forever preferred_lft forever

5）ping 绑定的外网ip

6）如果ping不通，看下安全组是否放通了ICMP协议

如果有错误之处，请您指正！