I can reproduce this just using lxc, which simply attaches an endpoint
of a veth tunnel to the bridge.  With balance-rr mode, i can't dhcp in
the guest.  With balance-alb, I can.

That means this is not actually qemu-kvm, but a bug in the kernel or
(unlikely) ifenslave.

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

** Changed in: qemu-kvm (Ubuntu)
       Status: Confirmed => Invalid

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/785668

Title:
  bonding inside a bridge does not update ARP correctly when bridged net
  accessed from within a VM

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