mannetworkingReviewed July 15, 2026

Bridge design and host uplinks

A Linux bridge is a layer 2 switch in the host. The host address belongs on the bridge, while the physical interface becomes a port of that bridge. Inspect without changing NetworkManager pattern Move the host IP configu

bridgenetworkmanageruplinkvlan

A Linux bridge is a layer-2 switch in the host. The host address belongs on the bridge, while the physical interface becomes a port of that bridge.

Inspect without changing

BASH

ip -br link
ip -br address
bridge link
bridge vlan show
nmcli -f NAME,TYPE,DEVICE,STATE connection show

NetworkManager pattern

BASH

nmcli connection add type bridge ifname br0 con-name br0
nmcli connection add type ethernet ifname eno1 master br0 con-name br0-port-eno1

Move the host IP configuration to br0 before activating the new topology. Remote changes can sever management connectivity; use console access, a maintenance window, and an explicit rollback connection profile.

Guest attachment proof

BASH

virsh domiflist guest01
ip link show master br0
bridge fdb show br br0

Do not run host DHCP on a bridge when the upstream network already owns address assignment unless the segments are intentionally isolated.

mannetworkingReviewed July 15, 2026

Bridge design and host uplinks

bridgenetworkmanageruplinkvlan

A Linux bridge is a layer-2 switch in the host. The host address belongs on the bridge, while the physical interface becomes a port of that bridge.

Inspect without changing

BASH

ip -br link
ip -br address
bridge link
bridge vlan show
nmcli -f NAME,TYPE,DEVICE,STATE connection show

NetworkManager pattern

BASH

nmcli connection add type bridge ifname br0 con-name br0
nmcli connection add type ethernet ifname eno1 master br0 con-name br0-port-eno1

Guest attachment proof

BASH

virsh domiflist guest01
ip link show master br0
bridge fdb show br br0

Do not run host DHCP on a bridge when the upstream network already owns address assignment unless the segments are intentionally isolated.