Am 2016-05-20 um 18:19 schrieb Matthias Leopold:
hi,
today i set up my first kvm guest, a centos 7 machine on a centos 6 kvm
host. there are already 3 guests (centos 6) running (not set up by me).
as far as i can see the setup is "the same", problem is as soon as i
start the network in the guest the host physical interface goes down:
"e1000e: eth0 NIC Link is Down". i'm using bridged networking, network
driver in the guest is virtio. when i use "e1000" driver in the guest
already starting the guest brings the host interface down. what could be
wrong?
network on the kvm host is maybe a bit special as there are 3 physical
interfaces altogether, one of them consists of two bonded SFP
interfaces. the 3 "old" kvm guests use these interfaces in bridge mode
with no problems. but they are centos 6, the new one is centos 7... is
there a difference?
dmesg says:
device vnet9 entered promiscuous mode
br0: port 5(vnet9) entering forwarding state
vnet9: no IPv6 routers present
kvm: 11206: cpu0 disabled perfctr wrmsr: 0xc2 data 0xffff
e1000e: eth0 NIC Link is Down
br0: port 1(eth0) entering disabled state
br0: port 5(vnet9) entering disabled state
device vnet9 left promiscuous mode
...
guest network configuration
<interface type='bridge'>
<mac address='52:54:00:67:36:89'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
okay....
all this was caused by switch configuration in our network, no relation
to kvm...
bye
matthias
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