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.