nwfilter: limit VM traffic to specific MAC

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Hi,
I am trying to add custom filter to block VM traffic to other VMs by limiting
the traffic only to the gateways MAC address.
The filter XML:

<filter name='rhev' chain='root'>
    <uuid>cd4e5890-ccc9-1b0f-303f-e7fe7123646d</uuid>
    <filterref filter='allow-dhcp'/>
    <rule action='drop' direction='out' priority='500'>
        <mac match='no' dstmacaddr='$MAC'/>
    </rule>
</filter>

The MAC is not the interface MAC address it's the gateways MAC that pass as a
parameter (I use the gateway address hardcoded as well).

The VM is getting DHCP ip but cannot get any traffic,
I notice that when I edit (comment and uncomment) the drop rule, the filter is
working fine, ie no traffic other then the gateway.

1. Am I doing something wrong?
1. What is the table name that libvirt use for ebtables?

Shahar.

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