Spanned port equivalent

[Mike Leddy]

I would like to be able to construct a box that can
promiscuosly sense traffic on a number of standard 100Mbps 
NICs and concentrate this traffic on an outgoing 1Gbps
interface.

Essentially any packets seen on the input nics would be 
copied and sent out unaltered on the output interface.

Does anyone know how I can achieve this ?

At the kernel level I have looked for inspiration in the 
bonding driver, bridging and netfilter but so far I've 
drawn a blank.

Would it be practical to do this in user space with three 
our four input NICS and heavy traffic ?

Thanks,

Mike

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