On 4/24/23 17:02, ToddAndMargo via users wrote:
Oh this took my breath away. The stinking update
trashed my bridge and took out all my qemu-kvm
virtual machines
My notes on how to restore br0:
My better updated notes:
How to add or restore a bridge (br0) when knocked out by an upgrade:
Reference:
https://www.thegeeksearch.com/how-to-configure-network-bridge-in-centos-rhel-7-using-nmcli-command/
https://www.thegeekdiary.com/how-to-create-a-bridge-interface-using-nmcli-in-centos-rhel-7-and-8/
Note: qemu-kvm virtual machines
After restoring, if br0 will not pass traffic in your virtual
machines (VM's),
go into virt-manager and set the networm interface to comethig
else, then set
it back to br0
Note: to remove a bridge:
# nmcli con show
# ip link set br0 down
# brctl delbr br0
# nmcli connection delete br0
# nmcli connection delete br0-port1
# nmcli connection delete bridge-br0
Test if you got it with with:
# nmcli con show
# brctl show
1. Get a list of the system’s active network connections:
# nmcli conn show --active
NAME UUID TYPE DEVICE
Wired connection 1 3bbdbba2-be96-3a0f-b0d5-b8a34912e7b7 ethernet eno1
virbr0 5ed314a7-f7d5-4719-9f8a-e144718b6288 bridge virbr
Note: plug something into the eno1, such as teh router to
activate it and do a
# nmcli device up eno1
2. Next, create a network bridge by typing:
# nmcli conn add type bridge con-name br0 ifname br0
NAME UUID TYPE DEVICE
Wired connection 1 3bbdbba2-be96-3a0f-b0d5-b8a34912e7b7 ethernet eno1
virbr0 5ed314a7-f7d5-4719-9f8a-e144718b6288 bridge virbr
3. Next, set a static IPv4 address for the bridge network:
Do not set a gateway
# nmcli conn mod br0 ipv4.address '192.168.255.10/24'
########## nmcli conn mod br0 ipv4.gateway '192.168.250.1'
# nmcli conn mod br0 ipv4.method manual
4. Now, add the ethernet interface, eno1, to the bridge, br0, connection:
# nmcli conn add type ethernet slave-type bridge con-name bridge-br0
ifname eno1 master br0
Connection 'bridge-br0' (cb23d052-f04d-4e0b-ae21-18cbc67f1bd6)
successfully added.
5. Activate the bridge connection:
# nmcli conn up br0
Connection successfully activated (master waiting for slaves) (D-Bus
active path: /org/freedesktop/NetworkManager/ActiveConnection/25)
6. Deactivate the ethernet interface, eno1:
# nmcli conn down eno1
Error: 'eno1' is not an active connection.
Error: no active connection provided.
7. Get a list of the active network connections:
# nmcli conn show --active
8. Display the current bridge port configuration and flags:
# bridge link show
<nothing>
9. Display the new network bridge interface:
# nmcli device up br0
Device 'br0' successfully activated with
'8d395a48-3de6-40e8-ad3a-c57aa5f35315'.
# nmcli conn up bridge-br0
Connection successfully activated (D-Bus active path:
/org/freedesktop/NetworkManager/ActiveConnection/28)
# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel
master br0 state UP group default qlen 1000
link/ether 52:12:34:56:78:5d brd ff:ff:ff:ff:ff:ff
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP group default qlen 1000
link/ether 52:12:34:56:78:5d brd ff:ff:ff:ff:ff:ff
inet 192.168.xxx.yy/27 brd 192.168.122.31 scope global
noprefixroute br0
valid_lft forever preferred_lft forever
10: more info:
# nmcli con show br0
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