Hi Rafael,

I will just reply to both emails here. First, it seems as though my
ebtables knowledge has gotten a bit rusty and there were some details
I forgot. The tool is used for firewalling bridges, so, the LAN and
WAN interface has to make up a bridge. I succeeded with a simple
configuration on my device, but it is not really usable for anything.
If something comes out of it, I will let you know.

On Sun, Aug 25, 2013 at 11:26 PM, Rafał Miłecki <zaj...@gmail.com> wrote:
> I guess you got some idea of what Broadcom can be doing in their magic
> ctf.ko. Could you share some details on that, please?

What I suspect is that the Brodcom-modules does, and why I thought of
ebtables, is some sort of static routing. Since a normal home router
only has a single WAN-connection, all traffic will go out through the
same port and, thus, full routing is not needed. Something similar to
switching would be sufficient. One would still have to do NAT though,
so it could be that the Broadcom module also does NAT. I am not sure
which device you are using, but if it one of these that have hardware
NAT, that would explain why the NAT calls are modified.

I am currently working on figuring out how to deal with a similar
problem. I will let you know if I come up with something.

-Kristian
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