Bug#697357: bridging broken over bond interfaces

[Reinhard Munz <munz.reinhard@gmail.com>]

Hi,

I had the same or at least a similar problem, upgrading from Squeeze to Wheezy broke the bridge over bond setup on my Xen server. As described before, the host was able to talk to the outside and the outside was able to talk to the host but no virtual guest was able to do so. After trying lots of different parameters, adding "bond-primary eth0 eth1" to both eth0 and eth1 finally made it work again. The following changes to the /etc/network/interfaces file are the only changes I've applied to the system (except for installing tcpdump and vlan packages).

I don't have the slightest clue why this works, so if someone has an answer I'd be interested to hear it.

Cheers,
Reinhard

/etc/network/interfaces working now with 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2 x86_64 GNU/Linux

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto bond0
iface bond0 inet manual
        bond-mode 802.3ad
        bond-miimon 100
        bond-downdelay 200
        bond-updelay 200
        bond-slaves none

auto eth0
iface eth0 inet manual
        bond-master bond0
        bond-primary eth0 eth1

auto eth1
iface eth1 inet manual
        bond-master bond0
        bond-primary eth0 eth1

auto br0
iface br0 inet static
        network         192.168.2.0
        gateway         192.168.2.1
        address         192.168.2.100
        broadcast       192.168.2.255
        netmask         255.255.255.0
        bridge_ports    bond0
        bridge_stp      off
        bridge_fd       0
        bridge_maxwait  0
        bridge_maxage   0
        bridge_ageing   0


/etc/network/interfaces working before with 2.6.32-5-xen-amd64 #1 SMP Sun Sep 23 13:49:30 UTC 2012 x86_64 GNU/Linux

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto bond0
iface bond0 inet manual
        bond_mode       802.3ad
        bond_miimon     100
        bond_downdelay  200
        bond_updelay    200
        slaves          eth0 eth1

auto br0
iface br0 inet static
        network         192.168.2.0
        gateway         192.168.2.1
        address         192.168.2.100
        broadcast       192.168.2.255
        netmask         255.255.255.0
        bridge_ports    bond0
        bridge_stp      off
        bridge_fd       0
        bridge_maxwait  0