Networking: IP , bridge and virtual network

Owned by Jean-luc KRIKER
Last updated: Sept 11, 2023
2 min read


Various tool:

ifconfig ( and a file # if configuration )

brctl ( bridge-utils package) create bridge,  it will be attach to a "host interface" and will have an IP@, tipical usage: mgt bridge or second interface/back up link

>>> New command:    ip link add name br0 type bridge

virsh ( libvirt ) create virtual network, internal vbridge, only between VM.

nmcli ( CLI version of networkmanager )

ip addr ... ( replacing ifconfig ) configure l2 and l3 parameters



CLI NetworkManager:

[root@hp8300 me]# nmcli device  

[root@hp8300 me]# nmcli connection



br0 is connected thru eno1 to the LAN  ( used for management )



Create a virtual network with virsh

main directory: /etc/libvirt/qemu/networks/

virsh net-define virbr1.xml
virsh net-start virbr1
virsh net-autostart virbr1


Basic Configuration:

set host-name vsrxremote
set  interfaces fxp0 unit 0 family inet address 192.168.0.61/24
set set system name-server 8.8.8.8
set routing-options static route default next-hop 192.168.0.1
set system root-authentication
set system services ssh root-login allow