安装 NetworkManager

```bash
sudo apt install -y NetworkManager
```

创建网桥，并启用 DHCP

```bash
sudo nmcli connection add type bridge con-name br0 ifname br0
sudo nmcli connection modify br0 ipv4.method auto  # 启用 DHCP
sudo nmcli connection modify br0 ipv6.method auto  # 启用 DHCPv6
```

添加网桥接口

```bash
sudo nmcli connection add type ethernet con-name eth0 ifname eth0 master br0
sudo nmcli connection add type ethernet con-name eth1 ifname eth1 master br0
```

启动网桥

```bash
sudo nmcli connection up br0
```

设置 网桥的 dns

```bash
sudo nmcli connection modify br0 ipv4.dns "223.5.5.5"
```

重启 NetworkManager

```bash
sudo systemctl restart NetworkManager
```

增加的配置在 `/etc/NetworkManager/system-connections/br0.nmconnection` 文件中