[Bug 34761] problems with a bridged network setup

[Thomas Schwinge]

Public bug reported:
https://launchpad.net/malone/bugs/34761

Affects: linux-meta (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
I want to configure my networking in a bridged mode: ath0 (Atheros
AR5212 802.11abg NIC) and eth0 (Intel 82540EP Gigabit Ethernet
Controller (Mobile)) are interfaces on the bridge br0, a DHCP client is
running on br0.

This works if I only attach ath0 or only attach eth0 to the bridge br0.

However, if I attach both of them to the bridge, things don't work
anymore:

#v+
[4368206.211000] device eth0 entered promiscuous mode
[4368228.688000] br0: port 1(ath0) entering disabled state
[4368229.688000] br0: port 1(ath0) entering learning state
[4368244.688000] br0: topology change detected, propagating
[4368244.688000] br0: port 1(ath0) entering forwarding state
[4368245.242000] br0: port 1(ath0) entering disabled state
[4368246.242000] br0: port 1(ath0) entering learning state
[4368261.242000] br0: topology change detected, propagating
[4368261.242000] br0: port 1(ath0) entering forwarding state
[4368261.684000] br0: port 1(ath0) entering disabled state
[4368262.683000] br0: port 1(ath0) entering learning state
[4368277.683000] br0: topology change detected, propagating
[4368277.683000] br0: port 1(ath0) entering forwarding state
[...]
#v-

As soon as I `sudo brctl delif br0 eth0', it works again.

Is this perhaps a problem with the Atheros driver?

It may be that the same problem also accurs wen having only ath0
attached to the bridge, but high network traffic occuring (I have to
check this).