Hi,
When I start a new VM, my host network stops functioning, and then I
have persistent issues with the host network thereafter, even after
shutting down all VMs.
The symptom of my network issues is that it intermittently goes down.
ping returns "Destination Host Unreachable" even for hosts on my local
network, although my routes still look good according to 'route -rn'. I
believe my network is flooded with STP packets at this point and all my
switches will go down shortly thereafter. I can recover for a while by
unplugging/replugging network cable but the problem comes back after a
few minutes. A reboot will clear it up.
On the host dmesg output, I see the following when this occurs:
http://pastebin.com/dpPk53d9
I am using the alx driver (AR816x/AR817x network controller) with Fedora 19.
I have attached output of 'brctl show', 'ip link', and 'ip address'. I
use NetworkManager, and disable WiFi manually before using libvirt.
I would very much appreciate any guidance.
Thanks,
Bob
bridge name bridge id STP enabled interfaces
virbr0 8000.52540075e7d6 yes virbr0-nic
virbr1 8000.525400b9370b yes virbr1-nic
virbr2 8000.525400a2f3ae yes virbr2-nic
vnet0 8000.dc0ea1f4b51e yes em1
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
DEFAULT
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master
vnet0 state UP mode DEFAULT qlen 1000
link/ether dc:0e:a1:f4:b5:1e brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen
1000
link/ether 9c:4e:36:2f:ec:b8 brd ff:ff:ff:ff:ff:ff
5: virbr2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state
DOWN mode DEFAULT
link/ether 52:54:00:a2:f3:ae brd ff:ff:ff:ff:ff:ff
6: virbr2-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr2
state DOWN mode DEFAULT qlen 500
link/ether 52:54:00:a2:f3:ae brd ff:ff:ff:ff:ff:ff
7: virbr1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state
DOWN mode DEFAULT
link/ether 52:54:00:b9:37:0b brd ff:ff:ff:ff:ff:ff
8: virbr1-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr1
state DOWN mode DEFAULT qlen 500
link/ether 52:54:00:b9:37:0b brd ff:ff:ff:ff:ff:ff
9: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state
DOWN mode DEFAULT
link/ether 52:54:00:75:e7:d6 brd ff:ff:ff:ff:ff:ff
10: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0
state DOWN mode DEFAULT qlen 500
link/ether 52:54:00:75:e7:d6 brd ff:ff:ff:ff:ff:ff
13: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
mode DEFAULT
link/ether dc:0e:a1:f4:b5:1e brd ff:ff:ff:ff:ff:ff
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master
vnet0 state UP qlen 1000
link/ether dc:0e:a1:f4:b5:1e brd ff:ff:ff:ff:ff:ff
inet6 fe80::de0e:a1ff:fef4:b51e/64 scope link
valid_lft forever preferred_lft forever
3: wlp2s0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether 9c:4e:36:2f:ec:b8 brd ff:ff:ff:ff:ff:ff
5: virbr2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state
DOWN
link/ether 52:54:00:a2:f3:ae brd ff:ff:ff:ff:ff:ff
inet 192.168.200.1/24 brd 192.168.200.255 scope global virbr2
valid_lft forever preferred_lft forever
6: virbr2-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr2
state DOWN qlen 500
link/ether 52:54:00:a2:f3:ae brd ff:ff:ff:ff:ff:ff
7: virbr1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state
DOWN
link/ether 52:54:00:b9:37:0b brd ff:ff:ff:ff:ff:ff
inet 192.168.250.1/24 brd 192.168.250.255 scope global virbr1
valid_lft forever preferred_lft forever
8: virbr1-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr1
state DOWN qlen 500
link/ether 52:54:00:b9:37:0b brd ff:ff:ff:ff:ff:ff
9: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state
DOWN
link/ether 52:54:00:75:e7:d6 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
10: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0
state DOWN qlen 500
link/ether 52:54:00:75:e7:d6 brd ff:ff:ff:ff:ff:ff
13: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether dc:0e:a1:f4:b5:1e brd ff:ff:ff:ff:ff:ff
inet 172.16.1.31/16 brd 172.16.255.255 scope global vnet0
valid_lft forever preferred_lft forever
inet6 fe80::de0e:a1ff:fef4:b51e/64 scope link
valid_lft forever preferred_lft forever
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