Source MAC address per IP packet
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Posted by on June 15, 2008, 3:02 pm
Please log in for more thread options for a networking application, I need to set the source MAC address individually for every IP packet that I send. Is this possible at all? I know that the MAC address can be changed in software but per IP frame? On the other hand, every layer 2 switch does exactly this, so it must be possible in principle. Do I need special network controller chips that support this feature? All datasheets of ethernet controllers I got hands on allow you to program the MAC address but it is then automatically filled in for every packet. Also, how would the programming side look like? I presume I must use RAW sockets but in which field would I set the source MAC address? Thanks, Albrecht | ||||||||||||||||||||||||||||
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Posted by hat-trick on August 10, 2008, 1:51 pm
Please log in for more thread options On Jun 15, 3:02=A0pm, albrechtuhlm...@gmx.net wrote: Albrecht, For what practical, benevolent purpose would you ever need to do this!? hat trick | ||||||||||||||||||||||||||||
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Posted by Patrick Schaaf on August 11, 2008, 2:17 am
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>For what practical, benevolent purpose would you ever need to do this!?
What about replaying network traces to test (possibly modified) packet filter rules? What about generating specifically formatted packets to test such rules where they try to match MAC addresses (whatever good that would do)? What about testing layer 2 switch MAC table overflow characteristics? best regards Patrick | ||||||||||||||||||||||||||||
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Posted by David Schwartz on August 11, 2008, 9:44 am
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> Albrecht,
> > For what practical, benevolent purpose would you ever need to do > this!? Aside from all the others suggested, the most obvious would be if you are implementing a transparent layer 2 switch/bridge. DS | ||||||||||||||||||||||||||||
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Posted by Arnold Nipper on August 11, 2008, 12:10 pm
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On 11.08.2008 15:44 David Schwartz wrote >
>> Albrecht,
>> >> For what practical, benevolent purpose would you ever need to do >> this!? >
> Aside from all the others suggested, the most obvious would be if you > are implementing a transparent layer 2 switch/bridge. > s/transparent/intransparent/ ? Otherwise I don't get what you are pointing at. Arnold | ||||||||||||||||||||||||||||
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>
> for a networking application, I need to set the source MAC address
> individually
> for every IP packet that I send. Is this possible at all? I know that
> the MAC address
> can be changed in software but per IP frame? On the other hand, every
> layer 2
> switch does exactly this, so it must be possible in principle. Do I
> need special
> network controller chips that support this feature? All datasheets of
> ethernet
> controllers I got hands on allow you to program the MAC address but it
> is then
> automatically filled in for every packet.
>
> Also, how would the programming side look like? I presume I must use
> RAW sockets
> but in which field would I set the source MAC address?
>
> Thanks,
>
> Albrecht