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Ethernet Loopback

Hi everybody!

Is there a free software availaible to emulate/generate an Ethernet loopback on a desktop/notebook/netbook?

I have searched the net for that kind of software but didn't get any useful results.

The software should be able to make a Layer2 loop by swapping source and destination MAC, while leaving the rest of the frame unchanged.

Another useful thing would be to make a Layer3 loop by swapping MACs and in addition source and destination IP while leaving the rest of the packet as is.

So this software should work like a "reflector" for the addressed Layers.

I'm not sure if this is the right place to ask such a question and the more I'm waiting for your responses.



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