Please someone have mercy on this poor soul.
What has me so mystified is that this all worked for many months - but now it's not, and I have no clue what happened or why.
Configuration: Centos 8 running libvirt 6.0.0.29 and qemu-kvm 15:4.2.0-35
Problem: bridge to host network has stopped passing traffic.
VM's configured to use this bridge cannot access the host network at all, no DHCP, no DNS, no nothing.
Please note again that this WAS working for months and I have no idea what happened to change/break it.
Code: Select all
# nmcli c show
NAME UUID TYPE DEVICE
virbr1 b670290d-efec-4ddb-b151-c504db171f5b bridge virbr1
conn-Bridge0 96f05ab9-88ab-434d-978a-c9cf1bae1e98 bridge ifc-Bridge0
docker0 2bba55b3-782e-4931-a03c-ed23175d2dd7 bridge docker0
docker_gwbridge 50e3585a-f172-4ee5-9fbc-09b1cbbf41db bridge docker_gwbridge
slave-Bridge0 ce06c20a-2b26-460a-9ac7-d09348ada2aa ethernet enp7s0
enp7s0 bfac8de3-0d1e-4cf5-80c8-14bb46b6d0ec ethernet --
https://www.tecmint.com/create-network- ... -centos-8/
I tried rebooting, I tried restarting the NetworkManager service, I used different names, I stopped firewalld, everthing I could think of.
Then the very last thing I tried, which was when using nm-connection-editor to define it all *one more time*, I used the 'general' tab while defining both the conn-Bridge0 connection and the slave-Bridge0 connection to place them in the 'trusted' firewall group instead of the 'default' firewall group. After I did that, things worked. I thought I had it licked.
But then today - it's not working and not passing traffic - again. After spending 7 hours on it so far today, nothing I've tried is working - not even changing the firewall group for the two components, not even completely shutting down firewalld.
I've got no idea what the root cause of this problem is.
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# nmcli d show
GENERAL.DEVICE: ifc-Bridge0
GENERAL.TYPE: bridge
GENERAL.HWADDR: 6C:F0:49:57:CD:C3
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: conn-Bridge0
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/3
IP4.ADDRESS[1]: 192.168.2.114/24
IP4.GATEWAY: 192.168.2.1
IP4.ROUTE[1]: dst = 0.0.0.0/0, nh = 192.168.2.1, mt = 427
IP4.ROUTE[2]: dst = 192.168.2.0/24, nh = 0.0.0.0, mt = 427
IP4.DNS[1]: 192.168.2.33
IP4.DNS[2]: 192.168.2.35
IP4.DOMAIN[1]: <hidden>
IP6.ADDRESS[1]: fe80::6f86:2186:a786:319a/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = fe80::/64, nh = ::, mt = 427
IP6.ROUTE[2]: dst = ff00::/8, nh = ::, mt = 256, table=255
GENERAL.DEVICE: enp7s0
GENERAL.TYPE: ethernet
GENERAL.HWADDR: 6C:F0:49:57:CD:C3
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: slave-Bridge0
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/5
WIRED-PROPERTIES.CARRIER: on
IP4.GATEWAY: --
IP6.GATEWAY: --
# ip link show type bridge
5: virbr1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000
link/ether e6:f2:d7:47:fc:f7 brd ff:ff:ff:ff:ff:ff
6: docker_gwbridge: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default
link/ether 02:42:3e:f4:8b:9c brd ff:ff:ff:ff:ff:ff
7: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default
link/ether 02:42:8b:e6:13:4e brd ff:ff:ff:ff:ff:ff
17: ifc-Bridge0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 6c:f0:49:57:cd:c3 brd ff:ff:ff:ff:ff:ff
ip link show type bridge_slave
2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master ifc-Bridge0 state UP mode DEFAULT group default qlen 1000
link/ether 6c:f0:49:57:cd:c3 brd ff:ff:ff:ff:ff:ff
10: veth794278c@if9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP mode DEFAULT group default
link/ether 26:79:60:e4:26:90 brd ff:ff:ff:ff:ff:ff link-netnsid 0
16: vethfffe0f3@if15: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker_gwbridge state UP mode DEFAULT group default
link/ether 3a:fd:f0:47:06:0f brd ff:ff:ff:ff:ff:ff link-netnsid 2
TIA
Bear