Linux Ethernet Bridging - Apr 2007 - [Bridge] Re: ethernet device xmit function is not gettting called

On Mon, 28 Jun 2004 20:21:59 +0530 (IST)
<ravivsn@www.rocsys.com> wrote:
> 
> Hi,
>  I wrote a module to create dummy ethernet device, the intention is to
> add it to a bridge and transmit modified packets. I get ethernet device
> created but its xmit function is not called when the bridge receives a
> packet.
The interface has to go through the Spanning Tree Protocol (STP) initialization
process to get into the forwarding state which takes a while
(and it has to be marked up).  Use 'brctl showstp br0' to see.
> I feel I have missed some information to register netdevice.
> 
> To add to bridge I did the following:
> brctl addbr br0
> brctl addif bro eth0
Typo, I assume you mean br0
> brctl addif br0 firsteth0
> ifconfig etho 0.0.0.0
Another typo. eth0
> ifconfig bro 172.16.2.100 up
> 
> When I try to add IP address to firsteth0, I get a kernel panic!!
Well since bridging is at the link, not network layer you shouldn't do that.
If it panic's send the console log (backtrace) and it will get fixed.
> Can we give IP to dummy ethernet device?
No, bridging is at layer 2 not layer 3. See the FAQ at
http://bridge.sourceforge.net
> 
> Please help, I am given little time to complete this :( I am attaching
> the code for the dummy ethernet device.
How is this different from the existing dummy device which works fine
in a bridge?