Bruce Simpson wrote: > I may not get free time to fix this right away, are you able to test a > patch when I can make one available? Sure. > It would be helpful if you could confirm, with a tcpdump capture forked > from single user mode, if your FreeBSD host is receiving an IGMPv2 query > when this problem is triggered. How do I do that? But it's not "when" it is triggered, but rather "if... ever". > It sounds like your university LAN may well have an IGMPv2 capable > multicast router present on the network. If you could double confirm > this, via packet capture, that would be great. Does this dump(snip) tell? 18:21:19.837291 IP binhlinh.teteny.bme.hu.50530 > 224.0.0.253.3544: UDP, length 40 18:21:23.450396 IP imperator.teteny.bme.hu.51605 > 224.0.0.252.5355: UDP, length 23 18:21:42.411459 IP lxandr.teteny.bme.hu.51045 > 224.0.0.252.5355: UDP, length 25 18:21:42.512624 IP lxandr.teteny.bme.hu.51045 > 224.0.0.252.5355: UDP, length 25 18:21:45.171807 IP lxandr.teteny.bme.hu.55288 > 224.0.0.252.5355: UDP, length 25 18:21:59.632491 IP 192.168.77.2 > ALL-SYSTEMS.MCAST.NET: igmp query v2 18:22:01.336805 IP tudylaptop.teteny.elte.hu > 224.0.0.251: igmp v2 report 224.0.0.251 18:22:06.356016 IP 192.168.77.2 > ALL-SYSTEMS.MCAST.NET: igmp query v2 18:22:06.364706 IP 192.168.77.2 > ALL-SYSTEMS.MCAST.NET: igmp query v2 18:22:08.851672 IP scylla.teteny.bme.hu.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 21.64.168.192.in-addr.arpa. (44) 18:22:08.873333 IP marhapalinka.teteny.elte.hu > 224.0.0.252: igmp v2 report 224.0.0.252 18:22:10.010465 IP fecsketurmix.teteny.elte.hu > 224.0.0.251: igmp v2 report 224.0.0.251 18:22:10.649814 IP ani.teteny.elte.hu.55741 > 224.0.0.252.5355: UDP, length 21 18:22:10.750069 IP ani.teteny.elte.hu.55741 > 224.0.0.252.5355: UDP, length 21 18:25:07.368543 IP 192.168.77.2 > 224.0.0.252: igmp query v2 [max resp time 10] [gaddr 224.0.0.252] > [I]f there is anything unusual about the format of the IGMPv2 queries from > your university's vendor equipment, that would be good to know too. Heh. How does that relate to the kernel code assigning a v3 handler to a v2 packet? (Looks something like that to me.) What if I say yes, and what if I say no? :) Anyways, I'll try to contact the admin about that.Received on Fri May 29 2009 - 22:05:52 UTC
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