can't ping MS-LNB - FreeBSD 9 - ARP is Multicast

Hello,

We have just recently updated FreeBSD 8 to 9. Since then it is not possible to ping our Microsoft NLB Cluster anymore, in 8.2 there were no problems.

In /var/log/messages the line

Code:
kernel: in_arp: 03:bf:##:##:##:## is multicast

appears (and the corresponding "last messages repeated 500 times" lines too).

I have found no clue except this http://freebsd.1045724.n5.nabble.co...-source-address-error-messages-td4975944.html, which indicates that there are two "culprits": MS is way too lax concerning the RFC and FreeSBD way too strict. ;)

We are running our terminal server NLB on this MAC, the whole thing runs on VMWare ESXi 5.0, our FreeBSD is on a standalone machine. The corresponding ESX/Windows admins told me that they could try to change the network config back to unicast, but this would involve severe changes in their field.

To cut this short: Is there a way to reenable the FreeBSD pre 9 behavior, allowing MAC Multicast?

(We have fixed this problem temporarily by routing the NLB-Clusters IP via another machine (FreeBSD 4(!)), which is really just a temporary solution due to the age of that gateway.)
 
After rereading my post I have to clarify/specify: the LNB is not reachable by our Freebsd FreeBSD-gateway and all our clients behind it at all! It's not only ping that does not work.

I hope someone can help me/us.
 
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