udp и tcpdump

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Помогите разобраться, в чем причина странного поведения сети на двух стендах, с идентичной программной конфигурацией?

На первом стенде имею такую картину по мультикасту:

14:27:15.938515 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1408) 172.17.12.172.21137 > 228.9.209.176.21137: UDP, length 1380
14:27:15.979210 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1420) 172.17.12.173.21137 > 228.9.209.176.21137: UDP, length 1392
14:27:16.300346 IP (tos 0x0, ttl   1, id 14507, offset 0, flags [+], proto: UDP (17), length: 1500) 172.17.12.24.32664 > 228.8.7.9.32664: UDP, length 3280
14:27:16.300372 IP (tos 0x0, ttl   1, id 14507, offset 1480, flags [+], proto: UDP (17), length: 1500) 172.17.12.24 > 228.8.7.9: udp
14:27:16.300375 IP (tos 0x0, ttl   1, id 14507, offset 2960, flags [none], proto: UDP (17), length: 348) 172.17.12.24 > 228.8.7.9: udp
14:27:16.387430 IP (tos 0x0, ttl   1, id 14508, offset 0, flags [+], proto: UDP (17), length: 1500) 172.17.12.24.32664 > 228.8.7.9.32664: UDP, length 3269
14:27:16.387455 IP (tos 0x0, ttl   1, id 14508, offset 1480, flags [+], proto: UDP (17), length: 1500) 172.17.12.24 > 228.8.7.9: udp
14:27:16.387457 IP (tos 0x0, ttl   1, id 14508, offset 2960, flags [none], proto: UDP (17), length: 337) 172.17.12.24 > 228.8.7.9: udp
14:27:17.442092 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1327) 172.17.12.172.21137 > 228.9.209.176.21137: UDP, length 1299
14:27:17.781309 IP (tos 0x0, ttl   1, id 6706, offset 0, flags [+], proto: UDP (17), length: 1500) 172.17.12.25.32664 > 228.8.7.9.32664: UDP, length 3280
14:27:17.781335 IP (tos 0x0, ttl   1, id 6706, offset 1480, flags [+], proto: UDP (17), length: 1500) 172.17.12.25 > 228.8.7.9: udp
14:27:17.781339 IP (tos 0x0, ttl   1, id 6706, offset 2960, flags [none], proto: UDP (17), length: 348) 172.17.12.25 > 228.8.7.9: udp

На втором все выглядит немного иначе:

14:29:38.246664 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1376) 192.168.101.31.20796 > 228.9.96.158.20796: UDP, length 1348
14:29:38.342192 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1376) 192.168.101.35.20796 > 228.9.96.158.20796: UDP, length 1348
14:29:38.468098 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1376) 192.168.101.33.20796 > 228.9.96.158.20796: UDP, length 1348
14:29:38.785107 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1377) 192.168.101.31.20796 > 228.9.96.158.20796: UDP, length 1349
14:29:38.868807 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1376) 192.168.101.34.20796 > 228.9.96.158.20796: UDP, length 1348
14:29:38.929030 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1377) 192.168.101.35.20796 > 228.9.96.158.20796: UDP, length 1349
14:29:39.497775 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1377) 192.168.101.34.20796 > 228.9.96.158.20796: UDP, length 1349
14:29:39.665147 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1377) 192.168.101.32.20796 > 228.9.96.158.20796: UDP, length 1349
14:29:39.750042 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1377) 192.168.101.33.20796 > 228.9.96.158.20796: UDP, length 1349
14:29:39.843439 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1457) 192.168.101.30.20796 > 228.9.96.158.20796: UDP, length 1429
14:29:40.270117 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1376) 192.168.101.31.20796 > 228.9.96.158.20796: UDP, length 1348
14:29:40.280848 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1376) 192.168.101.32.20796 > 228.9.96.158.20796: UDP, length 1348
14:29:40.404596 IP (tos 0x0, ttl   4, id 0, offset 0, flags [DF], proto: UDP (17), length: 1376) 192.168.101.35.20796 > 228.9.96.158.20796: UDP, length 1348

В чем может быть причина различного поведения? Конфигурация ПО идентичная. И куда копать? в настройках ОС или железок?

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