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kern/47313: xen/bridge multicast reception problem

>Number:         47313
>Category:       kern
>Synopsis:       dom0 doesn't react on domU's multicast packets
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Dec 12 15:00:00 +0000 2012
>Release:        NetBSD 6.0_RC2
computer science department, university of Bonn, Germany
System: NetBSD jaguar-eta 6.0_RC2 NetBSD 6.0_RC2 (XEN3PAE_DOMU) #8: Thu Sep 27 
17:08:35 CEST 2012
Architecture: i386
Machine: i386

        The original problem was that I can't ssh to a dom0 from a
hosted domU. Further examination showed that multicast packets (both
IPv4 and IPv6) from the domU can be tcpdump'ed on the dom0, but the
dom0 doesn't react on them. Bridging them to the cable works, though;
I see pongs and can connect to other machines on the LAN.

This has been tested with both xenkernel41/xentools41 and
xenkernel33/xentools33, on different machines with different
ethernet hardware. (bge vs. bnx)

All virtual and real machines run 6.0-postbeta1 or later, dom0 are amd64,
domU are i386-PAE.

        From a DomU:
        ssh -6 name-of-dom0 (from dom-U)
        ping6 ff02::1%xennet0


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