linux bridge

Nov 19, 2023#Linux333

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In a virtualized environment, a Linux bridge allows multiple virtual machines and the host machine's network interfaces to communicate on the same network. This facilitates direct communication between virtual machines and interaction with the physical network. The bridge can be configured using command line or GUI methods. The command line configuration involves creating the bridge device, configuring its IPv4 settings (either dynamically or statically), deleting the existing wired connection, and binding the network card. The Linux system needs to be restarted after these configurations. The GUI configuration requires setting the wireless network card to 4addr mode and selecting automatic connection in the general settings.

In a virtualized environment, you may have multiple virtual machines and host machine network interfaces, using a bridge can allow them to communicate on the same network. This facilitates direct communication between virtual machines and enables easy interaction with the physical network.

Choose one of the following options:

Command Line Configuration#

Create a bridge device

nmcli c add type bridge autoconnect yes con-name br0 ifname br0

Configure bridge IPv4

Dynamic allocation
nmcli c modify br0 ipv4.method auto
Static allocation
nmcli c modify br0 ipv4.method manual ipv4.address 192.168.3.10
nmcli c modify br0 ipv4.gateway 192.168.3.1
nmcli c modify br0 ipv4.dns 192.168.3.1

Delete the existing wired connection

nmcli c delete eno1

Bind the network card

nmcli c add type bridge-slave autoconnect yes con-name enp3s0f3u2c2 master br0

Restart Linux

GUI Configuration#

Wireless network card needs to be set to 4addr mode

# /etc/udev/rules.d/91-wifi-4addr-mode.rules
ACTION=="add", SUBSYSTEM=="net", ATTRS{address}=="04:cf:4b:21:76:0e", RUN+="/usr/bin/iw dev $name set 4addr on"

# address is the MAC address of the network card

It is recommended to select automatic connection in general configuration