/etc/libvirt/nwfilter/no-arp-mac-spoofing.xml is in libvirt-bin 1.3.1-1ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | <filter name='no-arp-mac-spoofing' chain='arp-mac' priority='-520'>
<rule action='return' direction='out' priority='350' >
<arp match='yes' arpsrcmacaddr='$MAC'/>
</rule>
<!-- drop everything else -->
<rule action='drop' direction='out' priority='1000' />
</filter>
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