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I have two programs: server ... it generates UDP traffic on a chosen multicast listener ... it prints UDP traffic on a chosen multicast (it subscribes to a multicast and prints whatever it receives). When I run the server on one machine and listeners on some (other) machine(s), the listener sees UDP traffic and prints it correctly. So these programs should be in a good shape. However, when I try to capture the traffic, on whatever machine, with tcpdump: sudo tcpdump -i eth0 'dst 233.65.120.153' -w 0.pcap and when I later try to replay it, on whatever machine, with tcpreplay: sudo tcpreplay -i eth0 0.pcap none of the listeners sees those captured packets: 09:38:40.975604 IP (tos 0x0, ttl 1, id 0, offset 0, flags [DF], proto UDP (17), length 32) 172.27.6.176.53507 > 233.65.120.153.64968: [udp sum ok] UDP, length 4 0x0000: 4500 0020 0000 4000 0111 6527 ac1b 06b0 E.....@...e'.... 0x0010: e941 7899 d103 fdc8 000c 579c 6162 6364 .Ax.......W.abcd 0x0020: 0000 0000 0000 0000 0000 0000 0000 .............. 09:38:41.975709 IP (tos 0x0, ttl 1, id 0, offset 0, flags [DF], proto UDP (17), length 32) 172.27.6.176.53507 > 233.65.120.153.64968: [udp sum ok] UDP, length 4 0x0000: 4500 0020 0000 4000 0111 6527 ac1b 06b0 E.....@...e'.... 0x0010: e941 7899 d103 fdc8 000c 579c 6162 6364 .Ax.......W.abcd 0x0020: 0000 0000 0000 0000 0000 0000 0000 .............. 09:38:42.975810 IP (tos 0x0, ttl 1, id 0, offset 0, flags [DF], proto UDP (17), length 32) 172.27.6.176.53507 > 233.65.120.153.64968: [udp sum ok] UDP, length 4 0x0000: 4500 0020 0000 4000 0111 6527 ac1b 06b0 E.....@...e'.... 0x0010: e941 7899 d103 fdc8 000c 579c 6162 6364 .Ax.......W.abcd 0x0020: 0000 0000 0000 0000 0000 0000 0000 .............. Note that even though none

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