This file is indexed.

/etc/network/ifupdown-scripts-zg2.d/proxy-arp is in ifupdown-scripts-zg2 0.6-1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/bash
# $Header:$

# IFACE         = Logical interface name
# MODE          = start | stop
# METHOD        = manual, otherwise exit!
# IF_DEVICE	= device to be used
# IF_PROXY_ARP  = 0/1 - should this interface be configured for proxy-arp

. /etc/network/ifupdown-scripts-zg2.d/common-functions

case "$MODE" in
  start)
    set_bool_value "proxy_arp" "$IF_PROXY_ARP"
    ;;
  *)
    ;;
esac

# end of file