> > On my 6.5 x64 system my bridged KVM guests (several kind 
> > of Windows and
> many kind of Linux guests) do not get the broadcast messages. Every network
> packets reach them from the subnet except broadcast and multicast messages.
> How can that be?

My desk notes indicate we do this locally, so we can see 
messaged transit iptables:

	  Next we have to make sure that network traffic going across 
	the bridge(s) can be filtered. So...

    cat >> /etc/sysctl.conf <<EOF
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1
    net.bridge.bridge-nf-call-arptables = 1
    EOF
    sysctl -p /etc/sysctl.conf


and in iptables this rule 

	-A FORWARD -m physdev  --physdev-is-bridged -j ACCEPT

and ip6tables

	-A RH-Firewall-1-INPUT -m physdev  --physdev-is-bridged -j ACCEPT


As I recall the need to do this is documented, but obscure, 
involving ebtables and iptables (ip6tables)

-- Russ herrold