virtualbox CARP interface regression

[Ross Alexander]

Folks,

I'm noticing that OpenBSD guests under vbox 4.1.2/FreeBSD-8-stable
don't seem to be able to form proper CARP groups on internal networks.
The emulated CARP interfaces report as good within the guest OpenBSD
machines, and CARP failover reports operation as usual.  BUT, other
guests on the same internal net can't hit the CARP address.

Reverting to virtualbox-ose-legacy fixes this.  CARPs, and even
carpnode load sharing, then work fine.  Can anyone offer some insight?
Perhaps there's an option setting I've missed?  The machine in
question was csup'd to 8-stable and then fully rebuilt (buildworld) on
Wednesday 12 October.  Both versions of vbox + vbox-kmod were then
successively built from the ports tree and tested against the same set
of guest images.

FWIW, pinging a carp in the 4.1 situation yields a valid arp cache
entry on the sending end, but a tcpdump on the receiving interface
comes up empty.

regards,
Ross
--
Ross Alexander, (780) 675-6823 desk / (780) 689-0749 cell, rwa at athabascau.ca

 	"Always do right. This will gratify some people,
 	 and astound the rest."  -- Samuel Clemens

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