I did post yesterday to get a working setup with several bridged interfaces used for virtual machines (KVM/libvirt).

One of the bridged interface is just using eth3 as its ports while the second one (public traffic) is using an ethernet bonded interface.

That setup is working but not all the time ! I can start a download from a vm, then it will stop and freeze!

So I don't know if my bridge parameters are correct, could you check the below config ?

iface eth3 inet manual

auto bond0
iface bond0 inet manual
    slaves eth1 eth2
    pre-up ip link set bond0 up
    down ip link set bond0 down

auto br0
iface br0 inet static
    address 10.160.0.7
    netmask 255.255.255.128
    bridge_ports eth3
    bridge_fd 9
    bridge_hello 2
    bridge_maxage 12
    bridge_stp on

auto br0:1
iface br0:1 inet static
    address 10.160.0.9
    netmask 255.255.255.255

auto br0:2
iface br0:2 inet static
    address 10.160.0.10
    netmask 255.255.255.255

auto br1
iface br1 inet static
    address 217.4.40.242
    netmask 255.255.255.240
    gateway 217.4.40.241
    pre-up /etc/network/firewall start
    bridge_ports bond0
    bridge_fd 9
    bridge_hello 2
    bridge_maxage 12
    bridge_stp on

auto br1:1
iface br1:1 inet static
    address 217.4.40.252
    netmask 255.255.255.255

auto br1:2
iface br1:2 inet static
    address 217.4.40.253
    netmask 255.255.255.255

And yes, it also sometimes speaks about martian on the host:

kernel: [249146.055172] martian source 10.160.0.17 from 10.160.0.10, on dev vnet2
kernel: [249146.073122] ll header: ff:ff:ff:ff:ff:ff:54:52:00:76:c3:5c:08:06