“network manager”

sudo pacman -S networkmanager
sudo systemctl status NetworkManager.service
sudo systemctl start NetworkManager.service
sudo systemctl restart NetworkManager.service
sudo pacman -S nm-connection-editor
sudo pacman -S network-manager-applet

nmcli device
nmcli connection
nmcli c delete

System policy prevents control of network connections

System policy prevents control of network connections System policy prevents modification of network settings for all users<

vim /usr/share/polkit-1/actions/org.freedesktop.NetworkManager.policy

Open /usr/share/polkit-1/actions/org.freedesktop.NetworkManager.policy with root/sudo privileges and search for the following line:

System policy prevents modification of network settings for all users A few lines below that should be this:

auth_admin_keep</allow_active> Change it to:

yes</allow_active> Save the file and restart your computer.

设置取值有: no Not authorized. yes Authorized. auth_self Authentication by the owner of the session that the client originates from is required.

auth_admin

Authentication by an administrative user is required.

auth_self_keep

Like auth_self but the authorization is kept for a brief period (e.g. five minutes).

auth_admin_keep

Like auth_admin but the authorization is kept for a brief period (e.g. five minutes).

典型的场景是把allow_active的设置从auth_admin (root密码) 改成auth_self (当前用户密码) 或者yes (不要密码) 。

配置文件

/etc/NetworkManager/NetworkManager.conf
/etc/NetworkManager/system-connections

network manager + openvpn 多个默认路由的问题

IPv4 Settings->Routes and checking “Use this connection only for resources on its network”. https://www.debuntu.org/how-to-network-manager-openvpn-overwrites-default-route/

DNS

vim /etc/NetworkManager/NetworkManager.conf

# add following lines
[main]
dns=systemd-resolved

使用 systemd-resolved, networkmanager 会把 /etc/resolv.conf 设置成 127.0.0.1:53, 当然 systemd-resolved 要配置成 DNSStubListener=yes 开启本地的 53 端口, 这样 dns 请求就交给 systemd-resolved 处理了.

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/configuring-the-order-of-dns-servers_configuring-and-managing-networking

禁用 NetworkManager，改用 systemd-networkd（Arch Linux）

# 停止并禁用 NetworkManager
sudo systemctl stop NetworkManager
sudo systemctl disable NetworkManager

# 启用并启动 systemd-networkd
sudo systemctl enable --now systemd-networkd

# 启用并启动 systemd-resolved（可选，用于 DNS 解析）
sudo systemctl enable --now systemd-resolved

# 将 /etc/resolv.conf 指向 systemd-resolved 的存根
sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf

配置网络接口，在 /etc/systemd/network/ 目录下创建 .network 文件，例如有线接口 DHCP 配置：

# /etc/systemd/network/20-wired.network
[Match]
Name=en*

[Network]
DHCP=yes

静态 IP 示例：

# /etc/systemd/network/20-wired.network
[Match]
Name=enp3s0

[Network]
Address=192.168.1.100/24
Gateway=192.168.1.1
DNS=1.1.1.1

创建配置后重启服务：

sudo systemctl restart systemd-networkd