[Qemu-devel] failed to fail over between two bonded interface under user mode network stack

[Mulyadi Santosa]

Hi all...

Recently, I did experiments to see what bonding can do. Therefore I
run Qemu using following command:
qemu-system-i386 -m 512 -hda ./centos.qcow2 \
 -net nic,model=e1000,vlan=0 -net user,vlan=0 \
 -net nic,model=e1000,vlan=0 -net user,vlan=0 \

The guest is CentOS 6.3. Host is Linux Mint 13 kernel 3.2.0-31-generic, using:
$ qemu-system-i386 --version
QEMU emulator version 1.0 (qemu-kvm-1.0), Copyright (c) 2003-2008
Fabrice Bellard

Inside the guest, I activate the bond interface using following command:
modprobe bonding mode=1 miimon=100 fail_over_mac=1 num_grat_arp=10 primary=eth0

Then I enslave both eth0 and eth1 inside guest:
ifenslave bond0 eth0 eth1

I give static IP to the bond0:
ifconfig bond0 10.0.2.10 netmask 255.255.255.0

In this case, eth0 is 10.0.2.15 and eth1 is 10.0.2.16

I check that bond0 is correctly configured, then I ping 10.0.2.2. So
far so good. But when I take eth0 down:
ifconfig eth0 down
Eth1 takes over as active slave, but pinging to 10.0.2.2.

What am I missing here?

Just for note, I do relatively similar thing inside VirtualBox, only
that there I use host only networking. It works fine: failover happens
and ping continues when I disable eth0.

Thanks in advance for your help.

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com