Re: Bug#697357: bridging broken over bond interfaces

[Ben Hutchings <ben@decadent.org.uk>]

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Forwarding this to netdev since the bug is still present in Linux 3.7.1.
For those joining us, this thread is archive at
<http://bugs.debian.org/697357>.

On Fri, 2013-01-04 at 13:40 +0100, Peter Palfrader wrote:
> On Fri, 04 Jan 2013, Bastian Blank wrote:
> 
> > On Fri, Jan 04, 2013 at 12:17:12PM +0100, Peter Palfrader wrote:
> > > I tried to set up a new KVM host in the usual way:
> > >   - have a bond0 interface over all physcial eth* interfaces
> > >   - create a br0 over that bond0 and any vnet* interfaces for the
> > >     guests.
> 
> Also, arp works through the bridge, forgot to mention that.
> 
> > > *   Manually switching the eth* to promiscious mode makes stuff work.
> > 
> > Okay, so a workaround is available.
> > 
> > When did it last work? Does it work with the kernel from experimental?
> 
> It works nicely on stable, e.g. pasquini.debian.org:
> 
> | weasel@pasquini:~$ sudo brctl show
> | bridge name     bridge id               STP enabled     interfaces
> | br0             8000.e83935a9ec10       no              bond0
> |                                                         tap0
> |                                                         tap1
> |                                                         tap2
> | br1             8000.e83935a9ec10       no              bond0.221
> | br2             8000.da1343affe92       no              bond0.3301
> |                                                         tap3
> 
> And there the bond interface is promisc automatically:
> weasel@pasquini:~$ ip a | grep -i bond
> | 2: eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP qlen 1000
> | 3: eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP qlen 1000
> | 4: bond0: <BROADCAST,MULTICAST,PROMISC,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP 
> | 7: bond0.221@bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP 
> | 9: bond0.3301@bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP 
> 
> Likewise it works as expected when one does br directly on eth0, without any
> bonding.
> 
> It's also broken with linux-image-3.7-trunk-amd64_3.7.1-1~experimental.1_amd64.deb.

-- 
Ben Hutchings
If you seem to know what you are doing, you'll be given more to do.

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