This file is indexed.

/etc/network/if-up.d/uml-utilities is in uml-utilities 20070815.1-2build1.

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/sh

test -n "${IF_UML_PROXY_ARP}" || exit 0
test -n "${IF_UML_PROXY_ETHER}" || exit 0

sysctl -w net/ipv4/conf/"${IFACE}"/proxy_arp=1

for i in ${IF_UML_PROXY_ARP};
do
  route add -host "$i" dev "${IFACE}"
  arp -Ds "$i" "${IF_UML_PROXY_ETHER}" pub
done