Am 03.01.2012 17:15, schrieb Stephen Hemminger:

On Tue,  3 Jan 2012 14:26:04 +0100
Richard Weinberger [off-list ref] wrote:

quoted

If net.bridge.bridge-nf-call-iptables or net.bridge.bridge-nf-call-ip6tables
are set to zero xt_physdev has no effect because skb->nf_bridge has not been set up.

Signed-off-by: Richard Weinberger <richard@nod.at>

I am not sure if this is a valid configuration. The setting of sysctl is saying
"don't do iptables on bridge (since I won't be using it)" and then you are later
doing iptables and expecting the settings as if the iptables setup was being
done.

I don't think so.

Also rules like this one are broken:
iptables -A INPUT -i bridge0 -m physdev --physdev-in eth0 -j ...

No firewalling is done on the bridge, xt_physdev is only using some meta
information.

At least a big fat warning would be nice that xt_physdev does not work
if bridge-nf-call-iptables=0.
It took me some time to figure out why my firewall rule set gone nuts on
RHEL6...

Instead, you should just enable the net.bridge.bridge-nf-call-iptables sysctl.
If a distro chooses to disable it then you may have to do it explicitly.

Fedora and RHEL have net.bridge.bridge-nf-call-iptables=0 per default
due to KVM network performance issues.
I'm sure I'm not the only user of xt_physdev on RHEL and friends.

Thanks,
//richard