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Old 3rd August 2011, 21:56
Mark_NL Mark_NL is offline
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It looks clear to me that the icmp responses are being send back to A.

11:46:49.528951 IP MachineC > ICMP echo reply, id 36931, seq 1, length 64
Do the test again, but this time, open up another connection to machine A and start a tcpdump on it and filter icmp. Do you see icmp responses on machine A when you have tcpdump running on it?

to be sure, run this on machine A and B and show us the results:
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