Networking to NetworkManager

Networking to NetworkManager

安装Debian过程，有选定桌面程式如：Gnome,Kde,xfce等，会被内定安装NetworkManager来管理网路连线，这是后期很方便的网路连线管理程式，它连Wifi一样也能管理的很棒，但如果你安装过程未选择桌面程式，那预设安装是不会帮你安装这套NetworkManager，会使用传统透过interfaces设定方式来设定，用法参照Debian NetworkConfiguration。

安装NetworkManager

更动网路管理功能有可能会造成网路断线、IP无法自动取得等问题，在之前先前缺少的套件先安装：

sudo apt-get install NetworkManager

变更预设网路管理程式

确保要被NetworkManager管理介面时，需要开启/etc/network/interfaces让被管理介面卡不在之中，假设介面名称ens33如：

# 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

# The primary network interface
allow-hotplug 
iface ens33 inet dhcp

删掉与ens33有关的设定，使它不再被Networking管理：

# 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

重新启动管理networking

sudo systemctl restart networking

启动NetworkManager

sudo systemctl start NetworkManager

指定管理介面卡

真正连立连线之前要将介面卡设定被NetworkManager管理：

nmcli device set ens33 managed yes

启动NetworkManager

sudo systemctl start NetworkManager

确认连线

NetworkManager正确接手网路连线管理时，会自动替要管理的介面建立一个连线设定档：

nmcli connection show

结果：

NAME                UUID                                  TYPE            DEVICE
Wired connection 1  b9b5976c-8372-3438-beda-98700652fca2  802-3-ethernet  ens33

查看一下IP是否取得：

ip a

结果：

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 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
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:37:fd:d0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.19.45/24 brd 192.168.19.255 scope global dynamic ens33
       valid_lft 3193sec preferred_lft 3193sec
    inet6 fe80::f82a:20d5:149e:f2a2/64 scope link
       valid_lft forever preferred_lft forever

手动建立连线设定档

nmcli connection add type ethernet conn-name [设定档名称] ifname [介面名称]

如：

nmcli connection add type ethernet con-name Wired ifname ens33

启动此设定档

nmcli connection up Wired

参考资料

How to Configure and Manage Network Connections Using ‘nmcli’ Tool

Connecting to a Network Using nmcli

[Ethernet device not managed](https://askubuntu.com/questions/882806/ethernet-device-not-managed)

nmcli 修改网卡设定

网络配置之nmcli