Re: Source MAC address through bridged connection

[Kelbel Junior <kelbel02@gmail.com>]

Well, being more specific...
The computer between the clients and the Mikrotik (border gateway) is
a squid proxy operating in bridge, to intercept all traffic on the
port 80

2011/5/19 Rick Jones <rick.jones2@hp.com>:
> On Thu, 2011-05-19 at 12:52 -0300, Kelbel Junior wrote:
>> Hi guys!
>>
>> I have the following scenario:
>>
>> Clients Network <------> Linux router <------> Mikrotik gateway
>> <------> INTERNET
>>
>> Happens what the Mikrotik gateway controls the clients from the mac
>> address (joining an ip to an MAC address) and when i put the linux
>> router between they the control don't works.
>> I saw on the MK(mikrotik) the packets coming in with the MAC address
>> from the bridge, and this is a problem.
>>
>> Exist some way to preserve the source mac through a bridged
>> connection, to continue seeing the mac address of the clients?
>
> Is the device in the middle a router, or is it a bridge?  The
> distinction is quite important.
>
> Conceptually, a router does it's thing at layer three of the (in)famous
> seven-layer model (*).  That means it only "preserves" layer three and
> above.  Layer 2 and below is not preserved.
>
> A bridge (or (multiport)switch, ignoring marktroid-speak about "L3
> switching") does it's thing at layer two.  That means it preserves layer
> two and above.  Layer 1 (physical) is not preserved.
>
> rick jones
>
> * there is also the nine-layer model
> http://www.isc.org/store/logoware-clothing/isc-9-layer-osi-model-cotton-t-shirt
>
>



-- 

Att.
Kelbel Junior