Modify the configuration file to implement a virtual network card instance

Regarding the configuration of the graphical interface, I will not introduce it here. This is very simple. Here is how to implement a virtual network card by modifying the configuration file.

First introduce the configuration of the virtual network card under ubuntu (I am using ubuntu-16.04 here)

1. First use ifconfig to view the current network card configuration

ens33     Link encap:以太网  硬件地址 02:0c:29:c6:be:c7  
          inet6 地址: fe80::20c:29ef:fec6:bec7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  跃点数:1  接收数据包:215 错误:0 丢弃:0 过载:0 帧数:0  发送数据包:256 错误:0 丢弃:0 过载:0 载波:0  碰撞:0 发送队列长度:1000 
          接收字节:25858 (25.8 KB)  发送字节:27711 (27.7 KB)

lo        Link encap:本地环回  
          inet 地址:127.0.0.1  掩码:255.0.0.0  inet6 地址: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  跃点数:1  接收数据包:165 错误:0 丢弃:0 过载:0 帧数:0  发送数据包:165 错误:0 丢弃:0 过载:0 载波:0  碰撞:0 发送队列长度:1 
          接收字节:12225 (12.2 KB)  发送字节:12225 (12.2 KB)

Generally, before setting, the printed information is as shown above.

2. View the current network card configuration and open the configuration file /etc/network/interfaces

sudo vim /etc/network/interfaces

You can see that there is only one network card for loopback testing Configuration

auto lo
iface lo inet loopback

3. Choose to add our own network card configuration. The first network card (ens33) configuration must be for the external network. If you configure it for the internal network, then This will cause your system to be unable to access the external network.

The address, mask and gateway are configured according to your actual network. My external network IP here is in the 172.16.2.xxx network segment.

auto ens33
iface ens33 inet static　　#设置静态IP，动态的是将static修改为dhcp，如果设置为动态IP无法设置虚拟网卡
address 172.16.2.95　　　　# 如果为动态IP以下的都不用配置。netmask 255.255.0.0gateway 172.16.254.254

4. Next configure the virtual network card (ens33:1)

Similarly, the IP of the intranet is configured according to the actual situation. Here I am The internal IP is in the 192.168.8.xxx network segment.

auto ens33:1iface ens33:1 inet static
address 192.168.8.95netmask 255.255.255.0gateway 192.168.8.1

In this way, you can access the internal and external networks at the same time.

Suppose you add an intranet virtual network card of another network segment.

auto ens33:2iface ens33:2 inet static
address 192.168.88.95netmask 255.255.255.0gateway 192.168.88.1

By analogy, multiple intranet network cards in different network segments can be added, all of which can access each other.

5. Configure the default gateway

Open /etc/resolv.conf

sudo vim /etc/resolv.conf

Add the above configuration to the configuration file The gateway of the network segment, we have configured three network segments here, then add the following information to our configuration file

nameserver 172.16.254.254nameserver 192.168.8.1nameserver 192.168.88.1

In previous versions, you can go here, but in In the new version, the above content will be added to another configuration file.

Open /etc/resolvconf/resolv.conf.d/base

sudo vim /etc/resolvconf/resolv.conf.d/base

Generally add the above three default gateways

nameserver 172.16.254.254nameserver 192.168.8.1nameserver 192.168.88.1

6. Restart the computer reboot

After modifying these changes, they will only take effect if you restart the computer. Use the command to restart the network card (sudo /etc/init.d/ networking restart) has no effect. The reason is unclear.

After restarting the computer and then using ifconfig to check, there will be configurations for multiple network cards, and they can all be used without conflicting with each other.

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