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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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