# Creating Bridged network for KVM using nmcli loses Eth0 **URL:** \ **Category:** Rocky Linux Help & Support\ **Created:** [September 19, 2023, 3:32pm UTC](https://forums.rockylinux.org/t/creating-bridged-network-for-kvm-using-nmcli-loses-eth0/11339 "2023-09-19T15:32:45Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![nico](https://avatars.discourse-cdn.com/v4/letter/n/b5a626/32.png) [@nico](https://forums.rockylinux.org/u/nico)\ **Post date:** [September 19, 2023, 3:32pm UTC](https://forums.rockylinux.org/t/creating-bridged-network-for-kvm-using-nmcli-loses-eth0/11339/1 "2023-09-19T15:32:45Z")
Hi there Please can you help me. we run these commands to add bridge networking to our Rocky 9.1 server sudo nmcli conn add type bridge con-name br0 ifname br0 sudo nmcli conn add type ethernet slave-type bridge con-name bridge-br0 ifname eth0 master br0 udo nmcli conn up br0 sudo nmcli conn down eth0 Now when I try to brigng up eth0 : sudo nmcli conn up eth0 sudo nmcli conn down br0 The eth0 device cant be found Unfortunately I did not know how to backup my network before I started creating a bridge Both my colleague and I lost our networks on the server and had to re-roll this a few times 1. is there a way to backup and restore the networking? 2. Is there a procedure that works for Rock 9.1 to create a KVM Bridge? 3. We want the bridge for our VMs to have networking but we still need to ssh to the server which we cant do after adding a bridge br0. how can we do that? 4 is these a working procedure we can use on Rocky 9.1 to have bridge and still be able to ssh to the server? kind regards Nico ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [September 19, 2023, 4:56pm UTC](https://forums.rockylinux.org/t/creating-bridged-network-for-kvm-using-nmcli-loses-eth0/11339/2 "2023-09-19T16:56:50Z")
> [@nico](#): > > ```auto > sudo nmcli conn add type bridge con-name br0 ifname br0 > sudo nmcli conn add type ethernet slave-type bridge con-name bridge-br0 ifname eth0 master br0 > > ``` That looks ok. - The physical interface (device `eth0`) has a connection named “bridge-br0” that acts as a port of the bridge “br0”. Ports do not have IP addresses - The host has connection “br0” that should have the IP address and whatnot that the host uses to communicate with other machines - There should not be any other connections for the device `eth0` In other words, _before_ the host had IPv4 config on connection “eth0”. _After_ the config must be on the “br0”. * * * The tricky part is if your only way to change the config of the host is via network, i.e. with ssh session. ---
**Author:** ![nico](https://avatars.discourse-cdn.com/v4/letter/n/b5a626/32.png) [@nico](https://forums.rockylinux.org/u/nico)\ **Post date:** [September 20, 2023, 10:04am UTC](https://forums.rockylinux.org/t/creating-bridged-network-for-kvm-using-nmcli-loses-eth0/11339/3 "2023-09-20T10:04:22Z")
Thank you for the information I will look at that ---
**Author:** ![system](https://us1.discourse-cdn.com/flex020/uploads/rockylinux/original/1X/91b7219eec10e30013422e4df76c1d898711a5d5.svg) [@system](https://forums.rockylinux.org/u/system)\ **Post date:** [November 19, 2023, 10:05am UTC](https://forums.rockylinux.org/t/creating-bridged-network-for-kvm-using-nmcli-loses-eth0/11339/4 "2023-11-19T10:05:06Z")
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