/etc/libvirt/nwfilter/qemu-announce-self-rarp.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 8 9 10 11 12 13 14 | <filter name='qemu-announce-self-rarp' chain='rarp'>
<rule action='accept' direction='out' priority='500'>
<rarp opcode='Request_Reverse'
srcmacaddr='$MAC' dstmacaddr='ff:ff:ff:ff:ff:ff'
arpsrcmacaddr='$MAC' arpdstmacaddr='$MAC'
arpsrcipaddr='0.0.0.0' arpdstipaddr='0.0.0.0'/>
</rule>
<rule action='accept' direction='in' priority='500'>
<rarp opcode='Request_Reverse'
dstmacaddr='ff:ff:ff:ff:ff:ff'
arpsrcmacaddr='$MAC' arpdstmacaddr='$MAC'
arpsrcipaddr='0.0.0.0' arpdstipaddr='0.0.0.0'/>
</rule>
</filter>
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