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What is the best possible way to send packets coming on an interface back to the same interface without changing anything in the packet. I want to have a loopback effect for the actual traffic coming on one of my interfaces e.g eth0
I think you can easily achieve this with Python/Scapy. Something like
sniff(iface="eth0", prn=lambda x: sendp(x, iface="eth0"))should do it.