ethernet tunnels with OpenSSH

Hello,

I've a problem with the ethernet tunnel feature of recent OpenSSH versions.

With a layer 3 tunnel all things are working great. Here is my setup:

A client with OpenSSH has one interface and is connected to an OpenSSH 
server. These server isn't the gateway of a network (but in another 
network than the client), so it has only one ethernet card. I can use an 
IP tunnel without problems. All is running fine on Linux with the tun 
interfaces. But I would like to use a layer 2 tunnel.

If I run on the client

ssh -o Tunnel=ethernet -w 0:0 server

the tap devices are created by OpenSSH.

On the server I've typed

brctl addbr br0
brctl addif br0 eth0
brctl addif br0 tap0
ifconfig br0 10.1.1.1

and then on the client I can see the ethernet broadcasts on the tap0 
interface! But, the client can't use these network, because on the 
server the requests don't sent in to the network. I've seen on the 
server ARP broadcast requests from the client, but no answers.

I haven't found examples for layer 2 tunnels with OpenSSH.

I'm happy abount any helpful hint

Thanks in advance

Micha