After upgrading from 7.2-RELEASE to 8.0-RC1 i have noticed problems with igmp. xorp sees IGMP_V2_LEAVE_GROUP, but not IGMP_V2_MEMBERSHIP_REPORT. igmpproxy has the same behavior. xorp_rtrmgr.log contains only: [ TRACE xorp_igmp MLD6IGMP ] RX IGMP_V2_LEAVE_GROUP from 192.168.0.10 to 224.0.0.2 on vif rl0 [ TRACE xorp_igmp MLD6IGMP ] RX IGMP_V2_LEAVE_GROUP from 192.168.0.10 to 224.0.0.2 on vif rl0 [ TRACE xorp_igmp MLD6IGMP ] RX IGMP_V2_LEAVE_GROUP from 192.168.0.10 to 224.0.0.2 on vif rl0 [ TRACE xorp_igmp MLD6IGMP ] RX IGMP_V2_LEAVE_GROUP from 192.168.0.10 to 224.0.0.2 on vif rl0 but /var/log/messages (KTR and KTR_VERBOSE enabled): kernel: cpu1 ip_mforward: delete mfc orig 192.168.0.10 group e0000002 ifp 0xc3e99400 kernel: cpu1 igmp_input: called w/mbuf (0xc494f900,24) kernel: cpu1 ip_mforward: delete mfc orig 192.168.0.10 group ef20013a ifp 0xc3e99400 kernel: cpu1 igmp_input: called w/mbuf (0xc4072300,24) kernel: cpu1 process v2 report 239.32.1.58 on ifp 0xc3e99400(rl0) kernel: cpu1 ip_mforward: delete mfc orig 192.168.0.10 group ef20013a ifp 0xc3e99400 kernel: cpu1 igmp_input: called w/mbuf (0xc4073500,24) kernel: cpu1 process v2 report 239.32.1.58 on ifp 0xc3e99400(rl0) kernel: cpu1 ip_mforward: delete mfc orig 192.168.0.10 group ef20013a ifp 0xc3e99400 kernel: cpu1 igmp_input: called w/mbuf (0xc429cc00,24) kernel: cpu1 process v2 report 239.32.1.58 on ifp 0xc3e99400(rl0) kernel: cpu1 ip_mforward: delete mfc orig 192.168.0.10 group e0000002 ifp 0xc3e99400 kernel: cpu1 igmp_input: called w/mbuf (0xc4926500,24) kernel: cpu1 ip_mforward: delete mfc orig 192.168.0.10 group ef200139 ifp 0xc3e99400 kernel: cpu1 igmp_input: called w/mbuf (0xc429fe00,24) kernel: cpu1 process v2 report 239.32.1.57 on ifp 0xc3e99400(rl0) kernel: cpu1 ip_mforward: delete mfc orig 192.168.0.10 group ef200139 ifp 0xc3e99400 kernel: cpu1 igmp_input: called w/mbuf (0xc4242a00,24) kernel: cpu1 process v2 report 239.32.1.57 on ifp 0xc3e99400(rl0) kernel: cpu1 ip_mforward: delete mfc orig 192.168.0.10 group e0000002 ifp 0xc3e99400 kernel: cpu1 igmp_input: called w/mbuf (0xc491f700,24) kernel: cpu1 ip_mforward: delete mfc orig 192.168.0.10 group ef200108 ifp 0xc3e99400 ... So the kernel processes igmp v2 reports, but user space daemons doesn't recieve it. Any suggestions? PS: It is not ipfw issue (when testing, the first ipfw rule is "allow ip from any to any") -- Alexander Zagrebin