Chez moi sans IGMP, point de salut:
tcpdump: listening on eth0.100, link-type EN10MB (Ethernet), capture size 262144 bytes
16:44:39.000602 IP (tos 0x0, ttl 1, id 63114, offset 0, flags [none], proto IGMP (2), length 32, options (RA))
0.0.0.0 > all-systems.mcast.net: igmp query v2
16:44:39.742779 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA))
176-133-x-y.abo.bbox.fr > all-routers.mcast.net: igmp v2 report all-routers.mcast.net
16:44:40.302753 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA))
176-133-x-y.abo.bbox.fr > igmp.mcast.net: igmp v2 report igmp.mcast.net
16:44:41.262736 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA))
176-133-x-y.abo.bbox.fr > 232.0.64.238: igmp v2 report 232.0.64.238
16:46:44.081735 IP (tos 0x0, ttl 1, id 63248, offset 0, flags [none], proto IGMP (2), length 32, options (RA))
0.0.0.0 > all-systems.mcast.net: igmp query v2
16:46:51.262881 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA))
176-133-x-y.abo.bbox.fr > 232.0.64.238: igmp v2 report 232.0.64.238
16:46:53.182789 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA))
176-133-x-y.abo.bbox.fr > igmp.mcast.net: igmp v2 report igmp.mcast.net
16:46:53.182914 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA))
176-133-x-y.abo.bbox.fr > all-routers.mcast.net: igmp v2 report all-routers.mcast.net
16:48:49.180922 IP (tos 0x0, ttl 1, id 63385, offset 0, flags [none], proto IGMP (2), length 32, options (RA))
0.0.0.0 > all-systems.mcast.net: igmp query v2
16:48:50.862810 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA))
176-133-x-y.abo.bbox.fr > igmp.mcast.net: igmp v2 report igmp.mcast.net
16:48:54.782747 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA))
176-133-x-y.abo.bbox.fr > 232.0.64.238: igmp v2 report 232.0.64.238
16:48:56.702776 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA))
176-133-x-y.abo.bbox.fr > all-routers.mcast.net: igmp v2 report all-routers.mcast.net
^C
12 packets captured
59 packets received by filter
0 packets dropped by kernel