2009/12/8 Bruce Simpson <b...@incunabulum.net>: > Andriy Syrovenko wrote: >> >> I have switched to 8-STABLE. Kernel does not seem to crash anymore, >> however IGMP still does not work. tcpdump complains that outgoing IGMP >> report and leave packets have incorrect checksum- it is always 0. >> Though I'm not sure weather it is IGMP checksum or IP checksum that is >> incorrect. >> > > This just sounds like a fairly normal artefact of tcpdump/bpf with checksum > offload, as I get the exactly same thing on my desktop w/ re(4). > > You need to confirm the checksums at the wire to be sure, or disable > rxcsum/txcsum: > # ifconfig re0 -txcsum -rxcsum I've checked w/ tcpdump on my MacBook connected to the same LAN segment the upstream interface of my router is connected to. The packets on the wire have bad checksums. And yes, I have re(4) interfaces as well. I'll try turning off checksum offloading today evening, as soon as I get to my router.
> Nothing has changed in the behaviour of the code which computes IGMP > checksums; it does not depend on the outer IP header, and isn't touched by > IP checksum offload, unless your network card (or its driver) is doing > something it shouldn't be doing. I have looked through the tcpdump source code, and am now fairly confident that it is IP (not IGMP) checksum that is broken. > Perhaps Florian can shed some light on your IGMP issue? igmpproxy only > understands IGMPv2, afaik. Yep, it is igmp v2 only indeed. _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
