/lib/udev/libvirt_vnet_querier_enable is in libvirt-bin 0.9.8-2ubuntu17.23.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/bash
if [[ $INTERFACE == virbr* ]]; then
/bin/echo 1 > /sys/devices/virtual/net/$INTERFACE/bridge/multicast_querier || true
fi
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