Linux Ethernet Bridging - Jan 2010 - [Bridge] [ebtables]Explanation of the packet flow...

Hi everybody !

I am trying to understand the "PacketFlow.png" image from the website.
I have several misunderstanding, especially on the "Bridging Decision"
circles.

I would like to understand which way a packet takes when the rule on
-A INPUT -j ACCEPT is on, for example. When looking at the packet
flow, I would say it is going to the "routing decision" circle, but, I
am not sure...

I would also like to understand what is necessary in order to have a
packet transparently directed from one interface to the other. I would
say that only the "-A FORWARD -j ACCEPT" rule is necessary, but
Wireshark doesn't agree with me...

Thanks in advance for your help.
Best Regards,
JM

Jean-Michel Hautbois schreef:
> Hi everybody !
>
> I am trying to understand the "PacketFlow.png" image from the
website.
> I have several misunderstanding, especially on the "Bridging
Decision" circles.
>
> I would like to understand which way a packet takes when the rule on
> -A INPUT -j ACCEPT is on, for example. When looking at the packet
> flow, I would say it is going to the "routing decision" circle,
but, I
> am not sure...
>
>   
It is handed to the IP layer, which includes a routing decision.
> I would also like to understand what is necessary in order to have a
> packet transparently directed from one interface to the other. I would
> say that only the "-A FORWARD -j ACCEPT" rule is necessary, but
> Wireshark doesn't agree with me...
>
>   
Ebtables is used to filter bridged traffic. You can't use ebtables to
direct a packet to another interface.

Bart

-- 
Bart De Schuymer
www.artinalgorithms.be