From owner-freebsd-virtualization@FreeBSD.ORG  Tue Mar  4 15:09:17 2014
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From: Mark Felder <feld@FreeBSD.org>
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Subject: Re: freebsd 10.0 not work carp protocol on Hyper-v
Date: Tue, 04 Mar 2014 09:09:00 -0600
Cc: Giovanni Mattera <giovanni.mattera@cost.it>,
 freebsd-virtualization@freebsd.org, Manuel Martini <posta@manuelmartini.it>,
 FreeBSD Net <net@FreeBSD.org>
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Did you try to enable spoofing of MAC Addresses in HyperV?

http://vbry21.wordpress.com/2012/07/03/fixed-in-a-tick-solving-mulicast-issues-in-hyper-v-vms/