从Debian 9开始，网络接口命名规则从ethxx更改为Ensxx约定。
Systemd/Udev的较新比V197释放需要这种变化。
我们可以在Systemd网络设备命名方案上阅读更多。

以下是我当前的网络配置：

$ip ad
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:6b:b7:3d brd ff:ff:ff:ff:ff:ff
    inet 192.168.121.52/24 brd 192.168.121.255 scope global dynamic ens5
       valid_lft 2747sec preferred_lft 2747sec
    inet6 fe80::5054:ff:fe6b:b73d/64 scope link 
       valid_lft forever preferred_lft forever

如果你痴迷于旧命名，就不要因为它可以改变而绝望。
要切换到旧架构，请在/etc/default/grub文件中添加以下内核参数到grub_cmdline_linux变量。

$sudo nano /etc/default/grub
......
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"

我们需要更新GRUB并在进行更改后重新启动系统。

$sudo update-grub
$sudo reboot

确认新网络配置。

$ip ad
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:6b:b7:3d brd ff:ff:ff:ff:ff:ff
    inet 192.168.121.52/24 brd 192.168.121.255 scope global dynamic eth0
       valid_lft 3563sec preferred_lft 3563sec
    inet6 fe80::5054:ff:fe6b:b73d/64 scope link 
       valid_lft forever preferred_lft forever